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17 June, 06:36

6. Red blood cells are made in the marrow. What two systems are

involved in the production of red blood cells?

endocrine and nervous systems

O circulatory and skeletal systems

nervous and skeletal systems

O circulatory and immune systems

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Answers (1)
  1. 17 June, 06:43
    0
    Endocrine and nervous systems.
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