Suppose you traveled back in time and located the first animals to have evolved feathers

You found that these animals were tree-dwelling ectotherms, able to run quickly but unable to fly. You also noticed that only males had feathers. Which hypothesis of feather evolution would these data most support? Feathers initially evolved in a role associated with _____.
A) flight
B) insulation
C) sexual selection
D) gliding


Answer: C

Biology & Microbiology

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The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes. The hollow, grape-like structures are the________.

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