13. The upper forelimbs of humans and bats have fairly similar skeletal structures,whereas the corresponding bones in whales have very different shapes andproportions. However, genetic data suggest that all three kinds of organisms divergedfrom a common ancestor at about the same time. Which of the following is the mostlikely explanation for these data?
(A) Forelimb evolution was adaptive in people and bats, but not in whales
(B) Whales are not properly classified as mammals
(C) Genes mutate faster in whales than in humans or bats
(D) Natural selection in an aquatic environment resulted in significant changes towhale forelimb anatomy