Answer:
I'm not alive but I grow I don't have lungs but I need air I don't have a mouth but water can kill me. What am I?
I start new then become old. Start clean but be one dirty. I usually start big then become little.
I am the ultimate killing machine used not once but TWICE I can be made by humans.
Soft hairy from door to door. I am the pet that always stays on the floor.
As a state in the USA, I am round on both sides and high in the middle. What am I?
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic