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  1. How many red blood cells does the bone marrow produce every second?

    2. A.
    2 million
    B.
    5 million
    C.
    7 million
    D.
    10 million

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    Answer : Option A

    Explanation :

    The formation of a red blood cell from hemocytoblast takes about 2 days. The body makes about two million red blood cells every second.

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