Riddles - 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. What am I?

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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. What am I?

Question: 1 / 7876 - Correct: 0 - Streak: ☆☆☆☆☆

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