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Q:

Methane an air pollutant is produced ___________

  • 1
    by burning of coal in insufficient air
  • 2
    by digestion of food by animals
  • 3
    by action of ultraviolet light on nitrogenous compounds.
  • 4
    as a by-product of manufacturing ammoniacal fertilizers
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Answer : 2. "by digestion of food by animals"

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