Answer:
What has three feet but no arms or legs?
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
Feed me and I live, give me drink and I die.
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.