Answer:
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
A device for finding furniture in the dark.
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
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.