Answer:
I am needed for most animals and hardcover books. What am I?
The most famous dinner
I walk on 4 legs in the morning 2 legs at noon and 3 legs at night.
I go in dry and come out wet. The longer I stay in, the stronger my surroundings get. What am I?
With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.