Protozoa Occurrence, Ecology.
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Protozoa Definition, Occurrence, Ecology

The term protozoa comes from the Greek word protos and Zoon, which means “first animal”. Protozoa are microscopic single-celled, eukaryotic protists that lack cell walls. The size of protozoa varies from 5 to 250 micrometers. The detailed study of protozoa is known as protozoology.