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Which is an example of using comparative anatomy to study evolutionary relationships?

comparing and contrasting the DNA of two organisms
studying the digestive system structure in two organisms
using ancient footprints to learn about an organism’s behaviors
looking at the development of a fertilized egg of an organism

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studying the digestive system structure in two organisms

Comparative anatomy examines and compares body structures (like organs or bones) to infer homologies and evolutionary relationships. Comparing DNA is molecular biology, footprints are trace fossils/behavioral evidence, and a fertilized egg’s development is studied in embryology.