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Bacteria are prokaryotic (no organized nucleus), single-celled (0.2-10 um) forming a group defined by structure and components of the cell. These ubiquitous inhabitants of many environments are predominantly unicellular microorganisms, but filamentous, mycelial, or colonial forms also occur. Cellular reproduction is generally by binary fission...
Fungi are eukaryotic organisms such as unicellular yeasts, multiucellular molds, and macroscopic varieties such as mushrooms. The thallus or colony of mold consists of long filaments called hyphae through which dissolved organic matter is absorbed. When environmental conditions are suitable, the hyphae grow, intertwine, and form a mass called mycelium.