In studying humans whales and horses which of the following set of similarities would be evidence for the most recent comment ancestor. They're all mammals, they all have hair, they all have internal skeletons or they all have similar bones in their limbs
The set of similarities that would be evidence for the most recent common ancestor would be that they all have similar bones in their limbs. This is because the structure of the bones in the limbs of mammals is a defining characteristic that would likely have been inherited from a common ancestor. The other similarities listed (being mammals, having hair, and having internal skeletons) are more general characteristics that are shared by a wide range of organisms and may not necessarily indicate a closer evolutionary relationship.
