Answer:
What force and strength cannot get through, I with my unique teeth can do. What am I?
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
I am a daily ritual involving using a metal tool on the body
I run up and down the stairs without moving. What am I?
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
Give it food and it will live, give it water and it will die.