Answer:
What do you have when you're sitting down that you don't have when you're standing up?
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
What instrument can make any sound and be heart, but not touched or seen?
Covered in stone and sun. It's home to many but also none. What is it?
People take me on walks and I run and have fun. What am I?