Which one can be replaced????
Well,man requires air,water and food to live,i was wondering with global warming and other factor which one of our need can be eliminated or replaced completely,i think food can be replaced as we can live without food for few days!!!!
I would really say none of them. So far alternate means of resources and generation of the items have been mentioned. You are still being dependant on the resource. Air, nutrients, water & a supportive environment cannot be replaced however the technology for providing these can adapt.
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