Severe anemia triggers the conversion of yellow marrow to red marrow to increase red blood cell production. This adaptation helps maintain sufficient oxygen in the blood. Understanding this process highlights the body's remarkable ability to respond to health challenges. ;
In severe anemia, yellow marrow is converted to red marrow to increase red blood cell production. This adaptation helps the body maintain adequate oxygen levels in the blood. Therefore, the correct answer is D: yellow marrow to red marrow.
;