Which of the following statements is correct?

  • A
    Biogas is produced by the action of aerobic bacteria on animal waste.
  • B
    Methanobacterium found in the rumen of cattle are aerobic.
  • C
    Biogas is commonly called gobar gas and contains pure methane.
  • D
    The sediment in the settling tanks of sewage treatment plants,called activated sludge,contains a large population of aerobic bacteria.

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