Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
De-nitrifying bacteria
Pectin decomposing bacteria
Nitrifying bacteria

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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
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
None of these

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