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A mutually beneficial relationship between two species is not called symbiosis, but is rather called "mutualism." The benefit is measured in terms of fitness; a combination of survival and reproduction. Symbiosis is the degree to which species are "together," which is used in terms of physical proximity or degree of dependency. Pathogens, ...


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Mycorrhiza refers to any fungi that forms a symbiotic relationship with a plant. There are many different species, and they are necessary for healthy plant growth in ~70%-80% of vascular plant species with representatives from more than ~90% of plant families. Needless to say, mycorrhiza associations with plants are very common. What you may be thinking of ...


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