Marrow helps in the manufacture of red blood cells and some white cells?

Bone marrow is the soft, sponge-like tissue that fills the cavities of bones. It produces all of the body's blood cells, including red blood cells, white blood cells, and platelets.

Red blood cells carry oxygen from the lungs to the rest of the body. White blood cells fight infection. Platelets help stop bleeding.

Bone marrow is also responsible for producing stem cells. Stem cells are immature cells that can develop into any type of cell in the body. This means that bone marrow can be used to treat a variety of diseases, such as cancer and leukemia.