Hardest Riddle Ever???????????????

*Use your whits to solve my riddles and discover a few of my many Aliases!
1.) I am the body of Christ:
2.) I'm white, thin, and chances are I'm in your office:
3.) I'm often put next to ketchup:
4.) La respuesta a esta adivinanza es: Lechuga
These are some of my many aliases amongst the MOBSTERS in the USA, but I am widespread across the planet... You spend most of you life trying to get me, because you need me to survive!
5.)What is my birth name? *Finial riddle*
Starts with "ahem!" and ends with a why? *cough* *cough*
(list all of the answers!) First to do it gets best answer!
 
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