Final answer:
Blood transfusions were a medical advancement resulting from World War I.
Step-by-step explanation:
The medical advancement that resulted from World War I was blood transfusions. During the war, there was a need for effective treatment for wounded soldiers who had lost significant amounts of blood. As a result, Charles Drew, an African American physician, developed the process of rendering blood plasma, which made it easier to store it for longer periods of time and offered an effective replacement for whole-blood transfusions.