Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
Syntrophism involves

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

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