Answer:
I am needed for most animals and hardcover books. What am I?
Goes over all the hills and hollows, Bites hard, but never swallows.
A large oasis in the desert. Come with cash and leave with none. What am I?
I am a chair that can move. What am I?
I canβt go left I canβt go right. I am forever stuck in a building over three stories high.
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.