Answer:
I regularly change shape yet remain a sphere. I am always there but not often seen. What am I?
Teenage girls are pros at creating me. Learn me in classes.
I have cities with no people, forests with no trees, and oceans with no water. What am I?
There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?
I fly when I'm on and float coming off.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.