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Partly right. Red bone marrow is found in spongy bone and is vital to the production of blood cells, but it is calcium salts that make bone hard. The medullary canal contains yellow bone marrow, which stores fat.

Wrong! Red bone marrow is found in spongy bone and is vital to the production of blood cells, but it is calcium salts that make bone hard. The medullary canal contains yellow bone marrow, which stores fat.