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  3. 6th Class
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6th Class Science Sample Paper Science Olympiad Model Test Paper-4

  • question_answer
    In the night both the fishes and the hydrilla plants take in ______and give out _______.

    A) Oxygen; oxygen

    B) Carbon dioxide; oxygen

    C) Oxygen; carbon dioxide

    D) Carbon dioxide; carbon dioxide

    E) None of these

    Correct Answer: C

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