All flashcards
Flashcard 1: What is an exoskeleton?
Answer: Hard external body covering that supports and protects. Found in arthropods and requires molting for growth.
Flashcard 2: Identify the body symmetry: humans have left and right mirror-image halves.
Answer: Bilateral symmetry. Body divided into matching left and right halves.
Flashcard 3: Which term describes similarity due to similar environments, not shared ancestry?
Answer: Convergent evolution. Unrelated species develop similar traits in similar environments.
Flashcard 4: What is the main anatomical clue that two structures are analogous?
Answer: Different underlying structure despite similar function. Different origins show independent evolution, not ancestry.
Flashcard 5: Identify the body symmetry: starfish have multiple similar parts around a center.
Answer: Radial symmetry. Body parts arranged equally around a central point.
Flashcard 6: Which group has a backbone: vertebrates or invertebrates?
Answer: Vertebrates. Defines animals with spinal columns versus those without.
Flashcard 7: What is the function of a vertebrate backbone (vertebral column)?
Answer: Supports the body and protects the spinal cord. Provides structural framework and nerve protection.
Flashcard 8: Identify the type of evolution: dolphins and sharks both have streamlined bodies.
Answer: Convergent evolution. Unrelated species develop similar traits independently.
Flashcard 9: Identify the type of evolution: finches with different beak shapes from one ancestor.
Answer: Divergent evolution. One species splits into many with different adaptations.
Flashcard 10: Which term describes increasing differences from a common ancestor over time?
Answer: Divergent evolution. Related species become different as they adapt to new environments.
Flashcard 11: What is the main anatomical clue that two structures are homologous?
Answer: Same underlying arrangement of parts and bones. Matching skeletal patterns reveal evolutionary relationships.
Flashcard 12: Which evidence best supports common ancestry: homologous or analogous structures?
Answer: Homologous structures. Same bone patterns prove shared evolutionary origin.
Flashcard 13: Identify the relationship: human arm, cat foreleg, whale flipper share bone pattern.
Answer: Homologous structures. Same bone arrangement despite different uses shows common ancestry.
Flashcard 14: Identify the relationship: bird wing and insect wing both enable flight but differ in anatomy.
Answer: Analogous structures. Different structures evolved separately for similar function.
Flashcard 15: Which structure is a common vestigial example in humans: appendix, heart, or femur?
Answer: Appendix. No longer aids digestion but remains from plant-eating ancestors.
Flashcard 16: Identify the skeleton type: a crab has a hard outer shell and molts to grow.
Answer: Exoskeleton. External skeleton limits growth, requiring periodic shedding.
Flashcard 17: What is an endoskeleton?
Answer: Internal skeleton that supports the body. Bones inside the body, typical of vertebrates.
Flashcard 18: Which body covering is typical of arthropods: endoskeleton or exoskeleton?
Answer: Exoskeleton. Insects, spiders, and crustaceans all have this external support structure.
Flashcard 19: What is the term for an internal skeleton made of bone or cartilage?
Answer: Endoskeleton. Bones or cartilage inside the body provide structural support.
Flashcard 20: What is the defining feature of vertebrates that distinguishes them from invertebrates?
Answer: A backbone (vertebral column). This flexible, segmented structure provides support and protects the spinal cord.
Flashcard 21: What is the main difference between homologous and analogous structures?
Answer: Homologous: shared origin; analogous: shared function. Origin vs. function distinguishes evolutionary relationships.
Flashcard 22: What is the term for body structures in different species that share a common ancestor?
Answer: Homologous structures. These structures evolved from the same ancestral feature.
Flashcard 23: What is the term for structures that have similar functions but evolved independently in unrelated groups?
Answer: Analogous structures. Convergent evolution produces similar solutions to environmental challenges.
Flashcard 24: Which type of similarity is strongest evidence of common ancestry: homologous or analogous structures?
Answer: Homologous structures. Shared ancestry creates similar internal structures across species.
Flashcard 25: Identify the anatomical pattern shared by human arm, cat foreleg, whale flipper, and bat wing.
Answer: Same bone arrangement (homologous forelimbs). Despite different functions, these limbs share the same basic bone pattern.
Flashcard 26: Which term describes the similar wing function in birds and insects despite different structures?
Answer: Analogous structures. Different evolutionary origins led to similar flight adaptations.
Flashcard 27: Which option best supports convergent evolution: homologous similarities or analogous similarities?
Answer: Analogous similarities. Unrelated species independently evolve similar features for similar functions.
Flashcard 28: Identify the best conclusion if two species have very similar bone arrangement in their forelimbs.
Answer: They likely share a common ancestor. Homologous structures indicate evolutionary relationships between species.
Flashcard 29: Which option indicates analogous structures: same bone pattern or same function with different structure?
Answer: Same function with different structure. Analogous structures serve similar purposes despite different origins.
Flashcard 30: Which option is a shared vertebrate trait: feathers, mammary glands, or a skull with a backbone?
Answer: A skull with a backbone. All vertebrates possess these protective and supportive structures.