This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a bird senses a hawk through its eyes. The pathway is: eyes detect hawk → nerves carry signals to brain → brain processes information (recognizes it as danger) → brain decides response (determines bird should escape) → brain sends commands through nerves to wing muscles → flying away happens. For example, bird's eyes see hawk shadow → signals go to brain → brain recognizes 'predator approaching' → brain sends command to wing muscles → bird flaps wings to fly away. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it has wrong sequence and goes directly from sense to response before brain. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a cat senses a mouse through its eyes. The pathway is: eyes detect mouse → nerves carry signals to brain → brain processes information (recognizes it as food) → brain decides response (determines cat should pounce) → brain sends commands through nerves to leg muscles → pouncing happens. For example, cat's eyes see mouse moving → signals go to brain → brain recognizes 'prey to catch' → brain sends command to leg muscles → cat jumps forward. Choice B is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice D is incorrect because it skips brain processing step and goes directly from sense to response. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a deer senses a wolf through its nose. The pathway is: nose detects smell → nerves carry signals to brain → brain processes information (recognizes it as danger) → brain decides response (determines deer should run) → brain sends commands through nerves to leg muscles → running happens. For example, deer's nose smells wolf scent → signals go to brain → brain recognizes 'predator nearby' → brain sends command to leg muscles → deer runs away. Choice C is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice D is incorrect because it skips brain processing step and doesn't show brain's role. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a human senses bitter taste through the tongue. The pathway is: tongue detects bitter taste → nerves carry signals to brain → brain processes information (recognizes it as potentially unsafe) → brain decides response (determines person should spit) → brain sends commands through nerves to mouth muscles → spitting happens. For example, tongue tastes bitter berry → signals go to brain → brain recognizes 'might be poison' → brain sends command to mouth muscles → person spits it out. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it skips brain processing step and goes directly from sense to response. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, an animal senses danger through a sense organ. The pathway is: sense organ detects danger stimulus → nerves carry signals to brain → brain processes information (recognizes it as danger) → brain decides response (chooses action like run) → brain sends commands through nerves to muscles → response happens. For example, ears hear predator noise → signals go to brain → brain recognizes 'danger approaching' → brain sends command to leg muscles → animal runs away. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it skips brain processing step and doesn't show brain's role. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, nerves are key in transmitting signals in the pathway. The pathway is: sensory organ detects stimulus → nerves carry signals to brain → brain processes information (recognizes what it is) → brain decides response → brain sends commands through nerves to muscles → response happens. For example, eyes see food → nerves send signals to brain → brain recognizes 'edible item' → brain sends commands via nerves to arm muscles → animal reaches for food. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice B is incorrect because it skips brain processing step and has nerves changing stimulus directly to movement. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a person senses a smoke alarm through ears. The pathway is: ears detect alarm sound → nerves carry signals to brain → brain processes information (recognizes it as danger) → brain decides response (determines person should wake) → brain sends commands through nerves to body muscles → waking up happens. For example, person's ears hear loud alarm → signals go to brain → brain recognizes 'fire danger, need to act' → brain sends command to body muscles → person wakes and moves. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it has wrong sequence and goes directly from sense to response before brain. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a fish senses vibrations through its lateral line. The pathway is: lateral line detects movement → nerves carry signals to brain → brain processes information (recognizes it as potential danger) → brain decides response (determines fish should dart away) → brain sends commands through nerves to body muscles → darting away happens. For example, fish's lateral line feels water vibrations from predator → signals go to brain → brain recognizes 'something approaching' → brain sends command to tail muscles → fish swims away fast. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it has wrong sequence and goes directly from sense to response before brain. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, a dog senses a doorbell sound through its ears. The pathway is: ears detect sound → nerves carry signals to brain → brain processes information (recognizes it as someone at door) → brain decides response (determines dog should alert) → brain sends commands through nerves to mouth muscles → barking happens. For example, dog's ears hear doorbell sound → signals go to brain → brain recognizes 'someone at door' → brain sends command to leg muscles and vocal cords → dog runs to door and barks. Choice A is correct because it shows the complete pathway: (1) sensory organ receives information, (2) information travels to brain, (3) brain processes/interprets, (4) brain sends commands, (5) body responds. This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice C is incorrect because it skips brain processing step and goes directly from sense to response. This error occurs when students think responses are automatic / don't realize brain interprets and decides / miss that information must travel to and from brain / confuse the stimulus with response / don't understand brain's central role. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - clap hands suddenly, students flinch. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'sudden loud sound, might be danger' → brain sent commands to muscles → muscles moved you away. Practice with multiple examples across different senses. Draw pathway diagram for each: [sensory organ] → [nerves] → [BRAIN processes] → [nerves] → [response organ] → [action]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT). Act out: One student is 'sensory organ' (sees something), says 'sending signal to brain,' student in middle is 'brain' (processes: 'I think this means...I should...'), says 'sending command,' third student is 'muscle' (responds by moving). Key concepts: (1) Senses receive different types of information (sight, sound, smell, taste, touch), (2) Brain receives information from ALL senses, (3) Brain interprets and decides what information means and how to respond, (4) Different information → different responses (danger→run, food→approach), (5) Brain is control center - all responses go through brain processing.

This question tests 4th grade understanding that animals receive information through senses, process it in the brain, and respond (NGSS 4-LS1-2). Students must understand the complete sense→brain→response pathway. How sensory information processing works: (1) RECEIVE - Sensory organs (eyes, ears, nose, tongue, skin) detect stimuli from environment (light, sound, smell, taste, touch, temperature, pain), (2) TRANSMIT - Nerves carry information as electrical signals from sensory organs to brain, (3) PROCESS - Brain receives signals, interprets what they mean (Is this danger? Food? Friend?), decides appropriate response, (4) COMMAND - Brain sends signals through nerves to muscles and organs, (5) RESPOND - Muscles move, body acts (run away, grab food, make sound, etc.). The brain is critical - it's not direct sense→response; brain interprets and decides. In this example, the dog senses the doorbell sound through its ears. The pathway is: ears detect sound waves → nerves carry signals to brain → brain processes information (recognizes it as 'someone at door') → brain decides response (determines dog should alert/investigate) → brain sends commands through nerves to vocal cords and leg muscles → dog barks and may run to door. For example, dog's ears hear doorbell ring → signals go to brain → brain recognizes 'visitor alert' → brain sends command to vocal cords → dog barks. Choice C is correct because it shows the complete pathway: (1) sensory organ receives information (ears detect sound), (2) information travels to brain (nerves send signals), (3) brain processes/interprets, (4) brain sends commands, (5) body responds (bark). This demonstrates understanding that the brain is involved in the middle - it's not automatic sense→response but rather sense→brain processing→response. The answer includes the critical brain processing step that many students miss. Choice A is incorrect because it skips brain processing step entirely - ears cannot tell muscles what to do directly. This error occurs when students think responses are automatic and don't realize brain interprets and decides. The key concept: Brain processes ALL sensory information and decides responses - it's not automatic muscle reaction (except some reflexes). To help students understand: Model with concrete examples - ring a bell, students turn heads. Trace pathway together: ears heard sound → nerves sent signals to brain → brain processed 'bell sound, need to look' → brain sent commands to neck muscles → head turned. Practice with multiple examples across different senses. Draw pathway diagram for each: [ears] → [nerves] → [BRAIN processes] → [nerves] → [vocal cords] → [bark]. Emphasize brain's role: receives information (signals come IN), processes (interprets, decides), sends commands (signals go OUT).