Answer:
What has no hands but might knock on your door, and if it does you better open up?
What goes up but never goes down?
I am always hungry, I must always be fed. The finger I lick will soon turn red.
What is something that can go up quite easily, but is not as easy to bring back down?
Where can you add 2 to 11 and get 1?
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.