Answer:
Man's most important invention.
What is the ending of all that begins?
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
What building has the most stories?
You can tumble in it, Roll in it, Burn it, Animals eat it, Used to cover floors, Still used beyond stall doors. Freshens whatever it is placed on, Absorbs whatever is poured into it. What is it?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?