Question

what is bone marrow ​

Answer 1

Answer:

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting.

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Answer 2

the bone marrow is the site of maturation  of all blood cells and the site of maturation of the B-lymphocyte