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algae ameba amoeba amoeba proteus animal bacteria bacteria cell bacterium biology cell cellular chlamydomonas reinhardtii diagram digestion education epidemiology euglena viridis eukaryotic eukaryotic cell food golgi immune cell immune system laboratory lactobacillus medical microbiology microorganism microscopic organism paramecium parasite pathogen phagocyte phagocytosis plankton probiotic protista protozoa protozoan pseudopodia reproduction research science single-celled structure unicellular unicellular organism vulgaris zoology

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