If we consider only the bugs living on golden rain tree and the effects of selection on the golden rain tree population, we see this is an example of isolation leading to selection, which in turn could lead to local adaptation.

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the flagellates share a facultative mutualist association with termites. mutualism is a biological interaction between individuals of different species, where both benefit from each other. this is called cooperation and it differs from other interactions such as cases of exploitation, such as parasitism, predation. in this interaction called association, both species cooperate and benefit.