(can't be a person, animal, profession or necessary bodily organs that sustain life)

I could not live without scientific progression, and I would not want to live without shoes. not for fashion purposes, but for protectionlol

the internet, and the internet. I'd be out of work, and out of entertainment!!

haha

air, and my eyes :p I think I win an award for being a jackass

i believe oxygen constitutes something "that sustains life"

but its not an organ

this is a hard question and will require some time to think it through...