Microbiology of Soils
Nitrogen fixation

both (a) and (b)
changes the free nitrogen (N2) to a form usable by plants
fix the free nitrogen (N2) by which it should not be usable by plants
especially changes nitrogen compounds, mostly amines such as NH2

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Microbiology of Soils
Syntrophism involves

no exchange of nutrients among species
exchange of nutrients between two species
exchange of nutrients among species
no exchange of nutrients between two species

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