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  1. _________ ecosystems are maintained artificially by man.

    2. A.

     Man-made
    B.

     Marine
    C.

     Artificial
    D.

     Brackish

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    Answer : Option A

    Explanation :

    Artificial ecosystems are maintained artificially by man. A pond constructed as a part of wastewater treatment plant is an example of artificial ecosystem. In these types of ecosystem, the only source of power is solar energy.

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