Good Riddles

Question: An archaeologist is searching some caves and discovers two frozen people that have somehow remained completely intact. He immediately recognizes them and knows that they are Adam and Eve, the first two people.

How did he know this?

Question: I can be sun,
I can be sand,
and I can be bird.

What am i?

Question: A butcher named butch is 6 feet tall and has size 12 shoes.

What does he weigh?

Question: Tom and Joe want to sit behind each other in class and the teacher arranges them so they are both happy.

How did the teacher do so?

Question: I plow and plow, but never sow.

What am I?