Compare Body Structures - Middle School Life Science
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What is an exoskeleton?
What is an exoskeleton?
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Hard external body covering that supports and protects. Found in arthropods and requires molting for growth.
Hard external body covering that supports and protects. Found in arthropods and requires molting for growth.
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Identify the body symmetry: humans have left and right mirror-image halves.
Identify the body symmetry: humans have left and right mirror-image halves.
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Bilateral symmetry. Body divided into matching left and right halves.
Bilateral symmetry. Body divided into matching left and right halves.
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Which term describes similarity due to similar environments, not shared ancestry?
Which term describes similarity due to similar environments, not shared ancestry?
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Convergent evolution. Unrelated species develop similar traits in similar environments.
Convergent evolution. Unrelated species develop similar traits in similar environments.
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What is the main anatomical clue that two structures are analogous?
What is the main anatomical clue that two structures are analogous?
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Different underlying structure despite similar function. Different origins show independent evolution, not ancestry.
Different underlying structure despite similar function. Different origins show independent evolution, not ancestry.
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Identify the body symmetry: starfish have multiple similar parts around a center.
Identify the body symmetry: starfish have multiple similar parts around a center.
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Radial symmetry. Body parts arranged equally around a central point.
Radial symmetry. Body parts arranged equally around a central point.
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Which group has a backbone: vertebrates or invertebrates?
Which group has a backbone: vertebrates or invertebrates?
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Vertebrates. Defines animals with spinal columns versus those without.
Vertebrates. Defines animals with spinal columns versus those without.
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What is the function of a vertebrate backbone (vertebral column)?
What is the function of a vertebrate backbone (vertebral column)?
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Supports the body and protects the spinal cord. Provides structural framework and nerve protection.
Supports the body and protects the spinal cord. Provides structural framework and nerve protection.
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Identify the type of evolution: dolphins and sharks both have streamlined bodies.
Identify the type of evolution: dolphins and sharks both have streamlined bodies.
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Convergent evolution. Unrelated species develop similar traits independently.
Convergent evolution. Unrelated species develop similar traits independently.
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Identify the type of evolution: finches with different beak shapes from one ancestor.
Identify the type of evolution: finches with different beak shapes from one ancestor.
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Divergent evolution. One species splits into many with different adaptations.
Divergent evolution. One species splits into many with different adaptations.
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Which term describes increasing differences from a common ancestor over time?
Which term describes increasing differences from a common ancestor over time?
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Divergent evolution. Related species become different as they adapt to new environments.
Divergent evolution. Related species become different as they adapt to new environments.
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What is the main anatomical clue that two structures are homologous?
What is the main anatomical clue that two structures are homologous?
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Same underlying arrangement of parts and bones. Matching skeletal patterns reveal evolutionary relationships.
Same underlying arrangement of parts and bones. Matching skeletal patterns reveal evolutionary relationships.
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Which evidence best supports common ancestry: homologous or analogous structures?
Which evidence best supports common ancestry: homologous or analogous structures?
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Homologous structures. Same bone patterns prove shared evolutionary origin.
Homologous structures. Same bone patterns prove shared evolutionary origin.
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Identify the relationship: human arm, cat foreleg, whale flipper share bone pattern.
Identify the relationship: human arm, cat foreleg, whale flipper share bone pattern.
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Homologous structures. Same bone arrangement despite different uses shows common ancestry.
Homologous structures. Same bone arrangement despite different uses shows common ancestry.
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Identify the relationship: bird wing and insect wing both enable flight but differ in anatomy.
Identify the relationship: bird wing and insect wing both enable flight but differ in anatomy.
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Analogous structures. Different structures evolved separately for similar function.
Analogous structures. Different structures evolved separately for similar function.
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Which structure is a common vestigial example in humans: appendix, heart, or femur?
Which structure is a common vestigial example in humans: appendix, heart, or femur?
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Appendix. No longer aids digestion but remains from plant-eating ancestors.
Appendix. No longer aids digestion but remains from plant-eating ancestors.
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Identify the skeleton type: a crab has a hard outer shell and molts to grow.
Identify the skeleton type: a crab has a hard outer shell and molts to grow.
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Exoskeleton. External skeleton limits growth, requiring periodic shedding.
Exoskeleton. External skeleton limits growth, requiring periodic shedding.
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What is an endoskeleton?
What is an endoskeleton?
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Internal skeleton that supports the body. Bones inside the body, typical of vertebrates.
Internal skeleton that supports the body. Bones inside the body, typical of vertebrates.
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Which body covering is typical of arthropods: endoskeleton or exoskeleton?
Which body covering is typical of arthropods: endoskeleton or exoskeleton?
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Exoskeleton. Insects, spiders, and crustaceans all have this external support structure.
Exoskeleton. Insects, spiders, and crustaceans all have this external support structure.
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What is the term for an internal skeleton made of bone or cartilage?
What is the term for an internal skeleton made of bone or cartilage?
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Endoskeleton. Bones or cartilage inside the body provide structural support.
Endoskeleton. Bones or cartilage inside the body provide structural support.
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What is the defining feature of vertebrates that distinguishes them from invertebrates?
What is the defining feature of vertebrates that distinguishes them from invertebrates?
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A backbone (vertebral column). This flexible, segmented structure provides support and protects the spinal cord.
A backbone (vertebral column). This flexible, segmented structure provides support and protects the spinal cord.
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What is the main difference between homologous and analogous structures?
What is the main difference between homologous and analogous structures?
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Homologous: shared origin; analogous: shared function. Origin vs. function distinguishes evolutionary relationships.
Homologous: shared origin; analogous: shared function. Origin vs. function distinguishes evolutionary relationships.
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What is the term for body structures in different species that share a common ancestor?
What is the term for body structures in different species that share a common ancestor?
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Homologous structures. These structures evolved from the same ancestral feature.
Homologous structures. These structures evolved from the same ancestral feature.
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What is the term for structures that have similar functions but evolved independently in unrelated groups?
What is the term for structures that have similar functions but evolved independently in unrelated groups?
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Analogous structures. Convergent evolution produces similar solutions to environmental challenges.
Analogous structures. Convergent evolution produces similar solutions to environmental challenges.
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Which type of similarity is strongest evidence of common ancestry: homologous or analogous structures?
Which type of similarity is strongest evidence of common ancestry: homologous or analogous structures?
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Homologous structures. Shared ancestry creates similar internal structures across species.
Homologous structures. Shared ancestry creates similar internal structures across species.
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Identify the anatomical pattern shared by human arm, cat foreleg, whale flipper, and bat wing.
Identify the anatomical pattern shared by human arm, cat foreleg, whale flipper, and bat wing.
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Same bone arrangement (homologous forelimbs). Despite different functions, these limbs share the same basic bone pattern.
Same bone arrangement (homologous forelimbs). Despite different functions, these limbs share the same basic bone pattern.
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