Answer:
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
I call the trees my home, yet I never go inside, and if I ever fall off the tree I will be surely be dead.
Come up and we go, Go down and we stay.
Who has married hundreds but always been single?
If you agree give me one of these.
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.