Who discovered blood groups?

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BLOOD is the fluid that flows throughout the body and is pivotal for the transportation of materials in and out of the body. Blood transfusion is the process in which blood is transferred intravenously or via vein. During this procedure, it is vital that the right type of blood is used as some of the groups are incompatible to each other.

Prior to the discovery of different blood types, patients bled to death due to