explain how blood group system flows in humans
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=> Human blood type is determined by the presence or absence of certain identifiers on the surface of red blood cells. ... There are four main ABO blood type groupings: A, B, AB, and O. These blood groups are determined by the antigen on the blood cell surface and the antibodies present in the blood plasma.
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blood is the fluid which flows in blood vessels. it transport substance like digestive food from the small intestine to the other part of the body
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