Microbiology of Soils
The microbial ecosystem of soil includes

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

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Microbiology of Soils
A heterocyst is

a type of spore
a cell that carries out oxygenic photosynthesis
a terminally differentiated cell that fixes nitrogen
the progenitor of cyanobacterial vegetative cells

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Microbiology of Soils
Syntrophism involves

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

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