Answer:
Where humans breathe liquid.
I saw the dead bring forth the living. I saw the living bring forth the dead. What did I see?
Old Mcdonald had this
You can carry it everywhere you go, and it does not get heavy. What is it?
Brothers and sisters I have none but this man's father is my father's son. Who is the man?
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?