Second, it proposed a theory to explain how evolution works.

However, there are three different theories to explain this event.

There is actually a nice theory to explain it, Morris said.

He did not offer a theory to explain the time between attacks.

But there are theories to explain the huge expected gate as well.

There are two current theories to explain the green color, he said.

Everybody has a theory to explain what went wrong with the juvenile stars.

So do you have a theory to explain all this?

And what is the theory to explain this result I got?

There are several puzzles for the new theory to explain.