What is the squishy substance found in long bones that proude red adin?

The squishy substance found in long bones that produces red blood cells is called bone marrow. Specifically, red bone marrow is responsible for hematopoiesis, the process of generating red blood cells, white blood cells, and platelets. This soft tissue is found primarily in the cavities of certain bones, such as the femur and humerus, and plays a crucial role in the body's circulatory and immune systems.