Answer:
I am a seed with three letters in my name. Take away the last two and I still sound the same.
Ripped from my ancestors home beaten and burned I become a bloodthirsty killer.
Who keeps the ocean clean?
What jumps when it walks, but sits when it stands?
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.