Microbiology of Soils
Nitrogen fixation

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

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Microbiology of Soils
Syntrophism involves

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

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