The diagram shows the leg bones of a (Left -> Right): Orangutan, dog, pig, cow, tapir, and horse. Most of the animals have the same bones, although some are shaped differently and placed in different positions.

Question

What does this suggest about mammals?
Responses
A That they shared a common ancestor.That they shared a common ancestor.
B That mammals are evolving to become more and more like one another.That mammals are evolving to become more and more like one another.
C That they all continue to use these structures for the same exact purpose.That they all continue to use these structures for the same exact purpose.
D That the shape of the bones has less to do with the environment pressures on the animal and more to do with what their relatives are.

Answer 1

A That they shared a common ancestor.