Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

changing of atmospheric nitrogen (N2) to nitrogen compounds
conversion of ammonium ions into nitrates through the activities of certain bacteria.
None of these
sulfur is oxidized to the sulfate form through Thiobacillus bacteria

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Microbiology of Soils
Denitrification is

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

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