Answer:
Weight in my belly trees on my back nails in my ribs feet I do lack.
I have Eighty-eight keys but cannot open a single door.
When I am alive, people sing. When I am dead, people clap hands. What am I?
Deposit red liquid in me.
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.