Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
Syntrophism involves

no exchange of nutrients between two species
no exchange of nutrients among species
exchange of nutrients among species
exchange of nutrients between two species

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