your answer to this is:<u><em>ABO blood group</em></u>
<u><em>EXPLATION: ABO blood group</em></u> system, the classification of human bloods based on the inherited properties of it's red blood cells<u><em> (erythrocytes</em></u>) as determined by the presence or the absence of the <u><em>antigens</em></u> A and B, which are carried on the surface of the red cells . Persons may this have type of <u><em>A, type B, type O, or type AB blood </em></u>inside the blood inside a human.