Only 2 possible answers?
It seems there are only 2 possible answers to the question you posed, ie
"Who can mankind have not lived without?"
(well maybe 3 or 4!)
A} Adam/Eve (or other primary creation of the God of the religion of choice)
B) The offspring of the parents of the forebearer of some unknown years ago who made the evolutionary cut of natural selection and from whom mankind eventually emerged.
Other people of modern times may have changed how we lived but mankind would have lived without them, nonetheless.
My vote is for B, by the way.
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