Answer:
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
Though it be cold, I wear no clothes. The frost and snow I never fear. I value neither shoes nor hose and yet I wander far and near. What am I?
What three letters change a boy into a man?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
No matter how little or how much you use me, you change me every month.