Answer:
you can throw me away but I will always be coming back
I've been around for millions of years, but I am no more than a month old. What am I?
I have a head, tail, but no arms and legs. What am I?
I can sizzle like bacon. I am made from an egg. I have plenty of backbone but lack a good leg. I peel layers like onions but still remain whole. I can be long like a flagpole yet fit in a hole.
I have keys but no locks. I have space but no room. You can enter but can't go outside. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.