Answer:
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
A great mysterious place that the bold have been known to journey into.
I work when I play and play when I work.
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
A man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?
People take me on walks and I run and have fun. What am I?