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These primitive bacteria, precursor models of the more conventional prokaryotes, are generally hosts found in extreme environments (as may have existed at the beginning of the Earth); they are now to be found in acid and/or extremely hot springs, hypersaline water, sea beds and also in the digestive tract of animals or, more specifically in water treatment, in methane fermenters. Table 2 provides a simplified system of the forms associated with these different mediums.

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Table 2. Archaebacteria