Answer:
I am needed for most animals and hardcover books
I run up and down the stairs without moving. What am I?
If a plane crashes on the border of US and Canada where do they bury the survivors?
I break down buildings, I crumble mountains but you can't see me. What am I?
I go up when the rain comes down
The answer I give is yes, but what I mean is no. What was the question?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic