Answer:
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
If eleven plus two equals one, what is nine plus five equal to?
What surrounds the world, yet dwells within a thimble?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?