Answer:
I can be written, I can be spoken, I can be exposed, I can be broken.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
A house of wood in a hidden place. Built without nails or glue. High above the earthen ground It holds pale gems of blue.
At night I come without being fetched. By day I am lost without being stolen.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?