asked 192k views
1 vote
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

1 Answer

2 votes

Endocrine and nervous systems .

answered
User Cheryl
by
8.1k points
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