Answer:
What starts with an 'e' and ends with an 'e' but only has one letter?
Iron roof, glass walls, I burn and burn but never fall. What am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
What always ends everything?
Lighter than what I am made of. More of me is hidden than seen. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?