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Bacteria are classified in Kingdom Monera. They are single-celled organisms. Bacteria come in two main groups - ones that require oxygen, called aerobic bacteria, and ones that do not require oxygen, called anaerobic. Bacteria have been found in every part of the earth, from hot springs at the very bottom of the ocean to glaciers in the antarctic. There may even be evidence of fossil bacteria from rocks on Mars!

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17y ago

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