Question

question 19 of 25 humans and gibbons have two different amino acids in their hemoglobin sequence. what does this say about the evolution of these two species? a. they have a recent common ancestor. b. gibbons evolved from humans. c. they are the same species. d. they are not closely related.

Explanation:

Similarities in hemoglobin amino - acid sequences suggest a close evolutionary relationship. Having only two different amino acids indicates a recent common ancestor. Gibbons did not evolve from humans (humans and gibbons are different primate lineages), they are not the same species, and the similarity shows they are closely related.

Answer:

A. They have a recent common ancestor.