Biology 10th Edition by Eldra Solomon,Charles Martin,Diana Martin,Linda Berg

تمرين 5

Dolphins and humans both have the ability to nurse their young, whereas the less closely related sharks do not. The ability to nurse their young is
A) a shared derived character of fish and mammals
B) a shared ancestral character of all vertebrates
C) a shared derived character of mammals
D) an example of homoplastic behavior
E) an example of reversal