Answer:
I can be swallowed, but I can also swallow you. What am I?
I am a ship that can be made to ride the greatest waves. I am not built by tool, but built by hearts and minds. What am I?
It's in your hand though you can not feel it. Only you and time can reveal it.
What goes up and down, but does not move?
A large oasis in the desert. Come with cash and leave with none. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.