I know what parasitism is it is a relation ship where only one side benefits and the other side is harmed but what is it called when one side benefits but the other side i neither benefits or is harmed?

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Commensalism also know as helping one side of the ecologic standards in nature without getting anything in return. vines cling to trees to get something to hold onto to, and to absorb some energy from the tree without actually killing it. this is another way to think about it because the tree gets absolutely nothing from the vines. 

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