Unicellular organisms (Protozoa)

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Protozoa are the biggest in size among micro organisms. Thier size varies from 2 to 100 microns. They are the most primitive from of life. Some of them live on dead animals and plants. But a majority of them are parasites, living in different parts of plants and animals. They inflict several diseases like malaria, and amoebic dysentery to human beings.