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

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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