Answer:
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.
I have legs but walk not, a strong back but work not. Two good arms but reach not. A seat but sit and tarry not.
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
What stays the same size no matter how much they weight?
The strangest creature you'll ever find has two eyes in front and a hundred behind.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?