Answer:
I'm written with two letters, said with one and seen with two. What am I?
I have two body parts but am used to measure length. What am I?
What goes in the water black and comes out red?
I am the signature stroll of ducks and penguins
A thousand wheels, but move I do not. Call me what I am, call me a lot. What am I?
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?