Answer:
Explanation:There are 4 main blood groups defined by the ABO system:
blood group A – has A antigens on the red blood cells with anti-B antibodies in the plasma
blood group B – has B antigens with anti-A antibodies in the plasma
blood group O – has no antigens, but both anti-A and anti-B antibodies in the plasma
blood group AB – has both A and B antigens, but no antibodies