Definition of "protozoa" [pro•to•zo•a]

• Plural form of protozoan. (noun)
• Plural form of protozoon. (noun)

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• "In other words, the existence of H1 in protozoa may best be explained by the existence of H1 in metazoans."
• "If H1 was indeed designed, given its minimal role in protozoa, it might constitute a very good example of front-loading evolution such that the initial eukaryotic state was prepared to evolve a multicellular state."
• "Living alongside bacteria—in water, soil, and bodies—were much larger but still microscopic single-celled organisms known as protozoa."