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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
1.1A: Defining Microbes - Biology LibreTexts
1.3 Types of Microorganisms - Microbiology | OpenStax
In brief: What are microbes? - InformedHealth.org - NCBI Bookshelf
Bacteria Overview | Ask A Biologist
Bacteria - Wikipedia