Answer:
I am often sold by children entrepreneurs in summer time
I save lives on the ground and in the air. What am I?
Iron roof, glass walls, I burn and burn but never fall. What am I?
I am a nut with a hole
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate, yet I have my own style of music. What am I?
Give it food and it will live, give it water and it will die.