Since the symbiotic relationship between the fern and its host tree results in the fern benefiting ( a place to live, gaining nourishment from elements collecting and moving along the tree's back) while the host is not affected at all, the relationship is called commensalism ( if the fern benefited and the host was damage, the relationship would be called parasitism; if both benefited, it would be mutualism)
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Since the symbiotic relationship between the fern and its host tree results in the fern benefiting ( a place to live, gaining nourishment from elements collecting and moving along the tree's back) while the host is not affected at all, the relationship is called commensalism ( if the fern benefited and the host was damage, the relationship would be called parasitism; if both benefited, it would be mutualism)