Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
equal to
generally smaller than
none of these

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Microbiology of Soils
A heterocyst is

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

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