Microbiology of Soils
The microbial ecosystem of soil includes

None of these
biotic components of soil
abiotic components of soil
biotic and abiotic components of soil

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Microbiology of Soils
Syntrophism involves

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

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Microbiology of Soils
Denitrification is

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

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