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Ram Sharma • 193.86K Points
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Q. _________ is a by product of sewage treatment & can be decomposed to produce biogas

  • (A) Scum
  • (B) Sludge
  • (C) Sewage
  • (D) Sewer
  • Correct Answer - Option(B)
  • Views: 291
  • Filed under category Science

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