Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

all of these
nitrogen fixation
denitrification
nitrification

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Microbiology of Soils
A heterocyst is

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

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