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8th Class Science Reproduction in Animals Question Bank Self Test-7

  • question_answer
    The gas, which are present in the earth atmosphere today, were not present in early days. According to the research, the main gas in the earth atmosphere, in the beginning, were methane, ammonia, etc. Which one of the following gases were not present in the early days in the earth atmosphere?

    A)  Methane

    B)  Hydrogen sulphide

    C)  Oxygen

    D)  Nitrogen

    E)  None of these

    Correct Answer: C

    Solution :


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