Answer:
I am easy to waste and unstoppable. What am I?
I'm where yesterday follows today and tomorrow is in the middle. What am I?
I can be swallowed But I can also swallow you.
I am needed for most animals and hardcover books. What am I?
I am found on Mercury Venus Earth and Mars but not on Jupiter or Saturn. What am I?
A little house full of meat, no door to go in and eat.