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Text File  |  1992-09-03  |  229b  |  7 lines
  1. One of a group of primitive bacteria
  2. (archaebacteria). They give off methane gas
  3. as a by-product of their metabolism, and are
  4. common in sewage treatment plants and hot
  5. springs, where the temperature is high and
  6. oxygen is absent.
  7.