Microbiology of Soils
The microbial ecosystem of soil includes

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

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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
Denitrification is

changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate to organic nitrogen compounds
both (a) and (b)
reduction of nitrate (NO3-) to nitrogen gas

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