Question

How are protozoa useful to us?

Answer 1

Protozoa play important roles in the fertility of soils. By grazing on soil

bacteria

, they regulate bacterial populations and maintain them in a state of physiological youth-

i.e.,

in the active growing phase. This enhances the rates at which bacteria decompose dead organic matter. Protozoa also excrete nitrogen and phosphorus, in the form of ammonium and orthophosphate, as products of their metabolism, and studies have shown that the presence of protozoa in soils enhances plant growth.

Hope it is ryt

Answer 2

Protozoans plays a very important role in food chain
They act as decomposers which returns important nutrients and minerals back to soil
Many aquatic animals fed on protozoa