What am I?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I start out the same as others, Then grow to four legs and four arms, And two hearts beat inside, Until the separation. What am I?

I’m often running yet I have no legs. You need me but I don’t need you. What am I?

I move at a tremendous speed, as fast as a car, and yet I’m always at the same place. What am I?

Riddles and Answers