what are the economic importance of amoeba
Amoeba graze on bacteria and keep the bacteria populations in active growth phases. This keeps he bacteria actively decomposing detritus in soil and aquatic systems.
The bacteria they eat contain a much higher carbon to nitrogen ratio so the amoeba release the excess nitrogen in the form of ammonium (NH4+). The ammonium is used by plants, algae, or fungi as their source of nitrogen for synthesizing nucleic acids, amino acids or chelating porphyrin rings for molecules like hemoglobin or chlorophyll.