What environmental factors do amoeba, euglena and ciliates depend on?

Amoeba, euglena and ciliates are microscopic, but still animals. Therefore, they, like all animals, depend on several types of factors, such as: physically, chemical and anthropogenic.

Physical factors of the environment include light, atmospheric pressure, temperature of the environment, and ionizing radiation.

Chemical factors include the salinity of the environment, acid balance, the presence of gases in the air, etc.

Since some representatives of these microorganisms can be dangerous to humans (dysentery amoeba), a person uses various poisons against them. This is an anthropogenic factor.