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  3. 3rd Class
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3rd Class Science Sample Paper Science Sample Paper-6

  • question_answer
    How trees keep the environment clean?

    A)  By emitting oxygen in the environment.

    B)  By emitting carbon dioxide in the environment.

    C)  By emitting nitrogen in the environment.

    D)  All of these

    E)  None of these

    Correct Answer:


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