Can somebody type me out a final report please ?

A blood type (also known as a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.