Answer:
I am needed for most animals and hardcover books. What am I?
I start in little but I end in full you'll find me in half and complete.
Keep doing me to avoid lens dryness
I am one with eight to spare, lest I lose my one. I'm not a number. What am I?
What is always in front of you but can't be seen?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.