Answer:
A precious fluid, thicker than water.
Reaching stiffly for the sky, I bare my fingers when its cold. In warmth I wear an emerald glove and in between I dress in gold.
Only two backbones and thousands of ribs.
It is a part of us, and then replaced. It escapes out bodies, to a better place. The world becomes its sizeable home. Its passions unrestraint, the planet it roams.
You can only have it once you have given it.
What is always coming but never arrives?