Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

both the species of a pair benefit
one species of a pair is more benefited
one species of a pair benefits
None of these

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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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