Answer:
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?
With three eyes and as black as night I frequently knock down ten men with a single strike!
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
What goes through towns and over hills but never moves?
I have roots nobody sees. I am taller than trees. Up, up I go but I never grow. What am I?
No matter how little or how much you use me, you change me every month.