Question

paleontologists have discovered several ancestors of the modern horse. based on the skeleton, the skull, and the leg bones, which fossil is the oldest? which fossil is most like a modern horse?

Explanation:

In the evolution of the horse, the earlier the ancestor, the more different it is from the modern - day horse. Mesohippus is an earlier ancestor compared to the others. Equus is the modern - day horse genus, so it is most like a modern horse.

Answer:

Which fossil is the oldest? Mesohippus
Which fossil is most like a modern horse? Equus