Homework Help: science

Posted by l on Sunday, September 9, 2012 at 11:57pm.

Analysis of forelimb anatomy of humans, bats, and whales shows that humans and bats have fairly similar skeletal structures, while whales have diverged considerably in the shapes and proportions of their bones. However, analysis of several genes in these species suggests that all three diverged from a common ancestor at about the same time. Which of the following is the best explanation for these data?

science - DrBob222, Monday, September 10, 2012 at 12:03am
You gave no choices.
science - l, Monday, September 10, 2012 at 12:04am
a. Evolution of human and bat forelimbs was adaptive, but not for whales.
b. Humans and bats evolved by natural selection and whales evolved by Lamarckian mechanisms.
c. Whales are not properly defined as mammals.
d. Natural selection in an aquatic environment resulted in significant changes to whale forelimb anatomy.
e. Genes mutate more rapidly in whales than in humans or bat
science - l, Monday, September 10, 2012 at 12:05am
I am thinking a, if they mean adaptive radiation...
science - l, Monday, September 10, 2012 at 12:08am
does anyone know?
science - drwls, Monday, September 10, 2012 at 7:37am
I would choose d.

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