What Am I Riddles

Question: I sizzle like bacon, I'm made with an egg.
I have plenty of backbone, but not a good leg.
I peel layers like an onion, but still remain whole.
I can be long like a flagpole, yet I fit in a hole.

What am I?

Question: What flies when it's born, lies when it's alive, and runs when it's dead?

Question: Some use me, while others do not.
Some remember, while others have forgot.
For profit and gain I'm used expertly, I can't be picked off the ground or tossed in the sea.
Only gained through patience and time, can you unravel my rhyme?

Question: Take my first and make it my last, now I happened in the past.

What am I?

Question: My name can have any letter of the alphabet, but I always have 2 X's.

What am I?