Blood type is identified primarily by

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Blood type is identified by both the ABO and Rh blood groups, which are the two main systems used for categorizing human blood. The ABO blood group classifies blood based on the presence or absence of antigens A and B on red blood cells, while the Rh blood group classifies blood based on the presence or absence of the Rh factor (antigen D). Together, these two systems can determine a person's blood type, such as A positive or B negative.

Blood Type Is Identified Primarily by