Answer :
All DNA is remarkably similar, but some more than others. Humans' DNA would be closer to other mammals' than it is to, say, a bird. Using DNA shows how varied an animal really is from another. Specific parts of the DNA code for different things, so you might see a similar structure for wings and flippers.
Answer:
Scientists could compare the DNA of the two species to confirm an evolutionary relationship.
Explanation: I used the Cells and hereditary book
