This term for 2 dissimilar organisms living together in mutualism comes from the Greek for "with" & "life"
I need another etymology: parasitism, helotism, commensalism, 
mutualism,... [DOC] [TLE] :   [PAR] Jun 27, 2016 ...  Symbiosis: Living Together in Chaos BRADFORD .... on 
each other that life apart is impossible