What is the most likely reason that horses and mountain goats have hooves?

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.

On edgenuity it is d: watermelons 

Ithink the answer is generation