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from Wikipedia, the free encyclopedia

Microorganism

A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye).

Microorganisms are often illustrated using single-celled, or unicellular organisms; however, some unicellular protists are visible to the naked eye, and some multicellular species are microscopic.

Note:   The above text is excerpted from the Wikipedia article "Microorganism", which has been released under the GNU Free Documentation License.
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July 31, 2015

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