Answer:
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
I start new then become old. Start clean but become dirty. I usually start big then become little. What am I?
What is black when it's clean and white when it's dirty?
Use me if you really want to see inside someone
What is the difference between a poorly dressed man on a bike, and a well-dressed man on a unicycle?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic