What is the useful effect of an amoeba?

Amoeba is an important part of the ecosystem, which are useful in maintaining the balance of algae and bacteria in the soil and water.

Nutrients present in soil are taken up by bacteria, that effectively lock up all the nutrients in bacterial mass, and when bacteria are consumed by amoeba, nutrients are released back into the soil which results in increase nutrient availability for plants.

Some specific amoeba, like "D discoideum" is an ideal model organism for studying a range of biomedical systems such as phagocytosis, cellular differentiation, signal transduction, cell motility and cytokinesis.

It also helped us to understand how drugs function on a molecular level and to identify genes controlling the action of medical treatments.