This term for 2 dissimilar organisms living together in mutualism comes from the Greek for "with" & "life"
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which living organisms exist or that is capable of supporting life, bio-"living"/ ... 
Symbiosis, Greek, the living together of two dissimilar organisms, as in mutualism
, ... mensa /, -ism "a state or condition" /, commence, commencal, come, combust.