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  1. ________ is a by product of sewage treatment and can be decomposed to produce biogas

    2. A.

     Sewage
    B.

     Sludge
    C.

     Sewer
    D.

     Scum

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    Answer : Option B

    Explanation :

    Sludge is a by product of sewage treatment and can be decomposed to produce biogas.

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