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

Nitrifying bacteria
De-nitrifying bacteria
Pectin decomposing bacteria
Cyanobacteia

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Microbiology of Soils
Denitrification is

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

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