Which describes vestigial structures and how they relate to evolution?
A. Snakes have tiny internal hind leg bones, indicating that they likely descended from lizards.
B. Humans and dogs have similar bone structures in their forelimbs, indicating a common ancestor.
C. Dolphins and birds have structures that are adapted for swimming, but the structures did not evolve the same way.
D. The DNA of mice and chickens shows similar patterns, suggesting that the two species are related.
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