Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
Denitrification is

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

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