In the section "Investigating Life: Sniffing Out the Origin of Feathers",birds are most closely related to reptiles,leading the scientists to conclude which of the following?
A) Endothermy arose once before the split of mammals and reptiles.
B) Endothermy arose once and was then lost in reptiles.
C) Birds are actually more closely related to mammals than reptiles.
D) Endothermy is not a good way to measure the relationship between species.
E) Endothermy arose twice after the split of mammals and reptiles.
Correct Answer:
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