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

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

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Microbiology of Soils
A heterocyst is

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

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