Symbiosis is a close relationship between different species where at least one requires the other for survival. Parasitism, commensalism, and mutualism are the major types of symbiosis. Why is the relationship between Rhizobium and its host considered mutualism and not one of the other types of symbiosis?

Is there a common evolutionary pathway between host and parasite?

Symbiotic associations are relationships that microbes have with us that can change over time.  List two symbiotic associations and explain them

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