Answer:
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
The more you take away from me, the bigger I shall get. What am I?
What runs around the whole yard without moving?
I'm the source of all emotion but I'm caged in a white prison.
What do you call a pig that is no fun to be around?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.