Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
None of these
abiotic components of soil
biotic and abiotic components of soil

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Microbiology of Soils
Nitrogen fixation

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

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