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?
I am the noblest musical instrument
I help engines spin and pants stay up
I am a celebrity fish.
What has a bottom at the top?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.