Commensalism
In ecology, commensalism is a class o relationships atween twa organisms whaur ane organism benefits frae the ither wioot affectin it. This is in contrast wi mutualism, in whilk baith organisms benefit frae ilk ither, amensalism, whaur ane is hairmed while the ither is wanaffeckit, an parasitism, whaur ane benefits while the ither is hairmed.
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