Answer:
It goes up and down the stairs without moving.
What can you hold in your left hand but can never hold in your right hand?
There is one in every corner and two in every room.
What comes with your car, but travels more than your car?
Kids play it and Michelangelo sculpted with it.
I appear in the morning. But am always there. You can never see me. Though I am everywhere. By night I am gone, though I sometimes never was. Nothing can defeat me. But I am easily gone.