[Citizen Blade]

If we evolved from lower animals, why do they still exist?

Why wouldn't they? There's nothing in the Theory of Evolution that requires an ancestral species to go extinct.

But, point in fact, though we share a common ancestor with the other great apes, that common ancestor is extinct.

[edpc]

that common ancestor is extinct

Nonsense. It was found and frozen in Georgia a few weeks back. I read it on the web. Also, one also drove the bus (until he was wounded) in the movie Speed.

[editor-surveyor]

"But, point in fact, though we share a common ancestor with the other great apes, that common ancestor is extinct."

We share no ancestor; we share a creator, and he lives.