Answer:
I transfer oxygen from the atmosphere to your blood
Fatherless and motherless. I was born without sin. Roared when I came into the world, but I never spoke again. What am I?
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
When I am caught, I am thrown away. When I escape, you itch all day. What am I?
I am a place where time is told. I am not bought and I am not sold. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.