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    Question

    The major and top source of oxygen in the atmosphere is

    A Photosynthesis by forest plants Correct Answer Incorrect Answer
    B Photosynthesis by oceanic plants Correct Answer Incorrect Answer
    C Photosynthesis by grassland ecosystem Correct Answer Incorrect Answer
    D More than one of the above Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Explanation: Phytoplankton and other oceanic plants contribute significantly to the Earth's oxygen production, more so than terrestrial forests and grasslands. 

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