1. Sewage is human waste carried by municipal drains.

    Sewage is human waste carried by municipal drains.

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  2. Sewage, industrial wastes, and fertilizers or pesticides.

    Sewage, industrial wastes, and fertilizers or pesticides.

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  3. Water pollution is degradation of the quality of water due to addition of undesirable substances or removal of desirable substances.

    Water pollution is degradation of the quality of water due to addition of undesirable substances or removal of desirable substances.

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