Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

none of these
generally greater than
equal to
generally smaller than

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Microbiology of Soils
Nitrogen fixation

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

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