Respuesta :
Answer:
Bone marrow.
Explanation:
Bone marrow creates stem cells in your body, a hormone is used to change stem cells into blood cells. This hormone is called erythropoietin .
Answer:
Bone marrow.
Explanation:
Bone marrow creates stem cells in your body, a hormone is used to change stem cells into blood cells. This hormone is called erythropoietin .