Answer:
I am needed for most animals and hardcover books. What am I?
I am the kind of nut that is empty at the center and has no shell.
You shoot me but I don't die. You hang me but I don't die. What am I?
I'm found in socks ties and hands. What am I?
I am in the middle of water but am not an island.
The answer I give is yes, but what I mean is no. What was the question?