試題詳解

14. Which of the following statement is the most likely explanation to support these observations? "The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time."
(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 to whale forelimb anatomy