Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of mold
ingestion of fungi
ingestion of bacteria
all of these

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Microbiology of Soils
A heterocyst is

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

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