Trivia: Which of these are produced by bone marrow?
Hormones
Blood cells
Antibodies
Acid
The correct answer is Blood cells
So why is this answer correct? : Bone marrow is the material within the bones, and produces 95% of the body’s blood cells. Blood cells in the bones begin as stem cells, which then become red blood cells, white blood cells, and platelets. The greatest amount of bone marrow can be found in the pelvis, the breast bones, and the spine.