Answer:
What is it that was given to you, belongs only to you. And yet your friends use it more than you do?
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
What is often returned, but never borrowed/
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
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?