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  1. Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by

    2. A.
    natural aeration of water stream.
    B.
    photosynthetic action of algae.
    C.
    both (a) & (b).
    D.
    neither (a) nor (b).

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    Answer : Option C

    Explanation :

    No answer description available for this question.

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