Answer:
I am needed for most animals and hardcover books
The person who makes me doesn't need me. The person who buys me doesn't use me. The person who uses me doesn't know it. What am I?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
What has roots that nobody sees and is taller than trees. Up up up it goes and yet never grows?
I am a mother from a family of eight. Spins around all day despite my weight. Had a ninth sibling before founding out it's fake.
Give it food and it will live, give it water and it will die.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic