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The four main classes of microorganisms are bacteria, fungi, viruses, and protozoa. Bacteria are single-celled organisms that can be beneficial or harmful. Fungi include yeasts and molds, playing essential roles in decomposition and fermentation. Viruses are acellular entities that require a host to replicate, while protozoa are single-celled eukaryotic organisms that often exhibit complex behaviors and can be free-living or parasitic.

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1w ago

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