"Evolution" joke

One day a 6 year old girl was sitting in the classroom. The teacher was going to explain evolution to the children. The teacher asked a little boy: Tommy do you see the tree outside?

Tommy: Yes.

Teacher: Tommy, do you see the grass outside?

Tommy: Yes.

Teacher: Go outside and look up and see if you can see the sky.

Tommy: OK. (He returned a few minutes later) Yes, I saw the sky.

Teacher: Did you see God?

Tommy: No.

Teacher: That's my point. We can't see God because he isn't there. He doesn't exist.

A little girl spoke up and wanted to ask the boy some questions. The teacher agreed and the little girl asked the boy: Tommy, do you see the tree outside?

Tommy: Yes.

Little girl: Tommy do you see the grass outside?

Tommy: Yessssss (getting tired of the questions by this time)

Little girl: Did you see the sky?

Tommy: Yessssss

Little Girl: Tommy, do you see the teacher?

Tommy: Yes

Little Girl: Do you see her brain?

Tommy: No

Little Girl: Does that mean she doesn't have one?