Answer:
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?
They come out at night without being called. They are lost in the day without being stolen. What are they?
Weight in my belly trees on my back nails in my ribs feet I do lack.
Long and thin red within with a nail at the end.
I moan I groan I chase after you. I never seem to rest. Timeβs up for you.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.