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You are at the aquarium looking at a freshwater mammal tank and an adult manatee swims close to the glass. On his front flippers you see fingernails. What is a likely explanation for the presence of fingernails on a manatee? A. They are analogous to human fingernails. B. They are homologous to fish fins. C. They are a developmental homology. D. They are analogous to bear claws. E. They are vestigial structures.
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