Answer:
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
I am the noise Santa's reindeers make
A dragons tooth in a mortals hand I kill I maim I divide the land.
I can be found after you remove 6 letters from BSAINXLEATNTEARS
As round as an apple. As deep as a cup. All the king's horses can't pull it up.