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definition of a bacterium

http://en.wikipedia.org/wiki/Bacteria

Bacteria are prokaryotic microorganisms. They are present in many areas on Earth such as soil, water etc. There are approximatively 40 million bacterial cells in a gram of soil and a million of bacterial cells in a millilitre of fresh water. However, there would be approximatively five nonilion (5x1030) bacteria all over the Earth.

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