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Bone marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.About 50% of red marrow converts to yellow marrow over time.one marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.
Best Answer: Blood cells are produced in the red bone marrow, within the skeletal system. So, the answer is #3. For the best answers, search on this site https://shorturl.im/avbIE B. Skeletal System Blood cells in produced by the red bone marrow in the bones. At birth, all bone marrow is red. With age, more and more of it is converted to the yellow type.