Answer:
The correct answer is - Porpoise, Sperm, Whale, Rt. Whale, and Hippo.
Explanation:
In the question the following combinations are given of the various species with only 2-4 differences in their DNA:
2 Porpoise - Sperm Whale
3 Sperm Whale - Rt. Whale
3 Porpoise - Rt. Whale
3 Hippo - Sperm Whale
3 Hippo - Porpoise
3 Cow - Giraffe
3 Deer - Giraffe
4 Hippo - Rt. Whale
4 Deer - Cow
Here numbers represent the differences in their DNA and on the basis of this combination we can say that Porpoise, Sperm, Whale, Rt. Whale, and Hippo found in all possible combinations with one another. It also tells that all these species diverged from the common ancestor.