Question

In studying humans, whales, and horses, which of the following set of similarities would be evidence for the most recent common ancestor?
A. they are all mammals.
B. they all have hair.
C. they all have similar bones in their limbs.
D. they all have internal skeletons.

Answer 1

C. they all have similar bones in their limbs.

This option provides evidence of a more recent common ancestor because similar bone structures in limbs (homologous structures) suggest that these organisms share a more recent evolutionary lineage. While the other options indicate that they are all mammals and have certain common features, limb bone structure specifically reflects evolutionary relationships and common ancestry more directly.