Answer:
I transfer oxygen from the atmosphere to your blood
I can only be played on a windy day
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I?
When it comes to me, you go on red and stops on green. What am I?
A little house full of meat, no door to go in and eat.