Red blood cells live for _______ and then are replaced by new cells that are produced in bone marrow.

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     3 to 4 days
      3 to 4 years
      3 to 4 months
      3 to 4 weeks
asked Jun 25, 2013 in Nutrition by anonymous
    

1 Answer

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3 to 4 months
answered Jun 26, 2013 by Ilovefood ~Expert~ (4,050 points)

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