$A$ very high concentration of $E. coli$ in water indicates $.........$

  • A
    Industrial pollution
  • B
    Sewage pollution
  • C
    High concentration of chlorine in water
  • D
    All of the above

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Assertion $(S)$: Flocs are organisms that consume inorganic substances in water.
Reason $(R)$: $STPs$ are used to prevent water pollution.

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Identify the correct statement from the following.

During the primary treatment of sewage,solid particles that settle down are called

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