Answer:
What goes up and down the stairs without moving?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair
This is your stomach's way of letting you know you've neglected it.
What is red and smells like blue paint?
A person's greatest asset.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.