Answer:
A squiggly line tells you when you've done it wrong
Even if you throw it away, it still comes back.
Which weighs more? A pound of iron or a pound of feathers?
Makes dough grow
What is something yet nothing, but if you fill it up it will disappear?
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.