Answer:
Its title means book.
When I’m metal or wood, I help you get home. When I’m flesh and I’m blood, In the darkness I roam.
What is it that given one, you’ll have either two or none?
It is a part of us, and then replaced. It escapes out bodies, to a better place. The world becomes its sizeable home. Its passions unrestraint, the planet it roams.
Jack and Jill when up the hill jack fell down
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?