Answer:
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
Which button does not function when being pressed?
I am so simple that I can only point. Yet I guide men all over the world.
What is the freedom of birds and the pen of old men?
How far will a blind dog walk into a forest?
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.