A scientist argues that the hair of mammals and the feathers of birds are analogous structures. If the scientist is correct, what is the evolutionary relationship between hair and feathers? A. Either hair evolved from feathers, or feathers evolved from hair.
B. Both hair and feathers evolved from the same structure in a common ancestor of birds and mammals.
C. Hair evolved in mammals at the same time as feathers evolved in birds.
D. The evolution of hair in mammals occurred independently of the evolution of feathers in birds.