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Microbiology | Definition, History, & Microorganisms | Britannica
Microorganism - Wikipedia
Microorganism - Definition, Types, Examples & Quiz - Biology …
Microbiology - Bacteria, Viruses, Fungi | Britannica
Bacteria | Cell, Evolution, & Classification | Britannica
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In brief: What are microbes? - InformedHealth.org - NCBI Bookshelf
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Microorganism - New World Encyclopedia
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