Answer:
I transfer oxygen from the atmosphere to your blood
I am an English word with three consecutive double letters. What am I?
Sometimes I am white, sometimes I am dark. Most people love me. What am I?
I am a word. I become longer when the third letter is removed. What am I?
Tear one off and scratch my head what was red is black instead. What is it?
What did the piece of wood say when he saw the screwdriver and screws approaching?