Answer:
A tiny bead, like fragile glass, strung along a cord of grass.
Poor people have it. Rich people need it. If you eat it you die. What is it?
In the sun it likes to play; In the rain it goes away; Walk or run it always follows; In the mud it always wallows.
It is a form of plastic money.
You feel this sensation when you are dehydrated.
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.