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Rarest Blood Type or Group in the World, A, B, AB, O, Rhesus Factor (Rh+, Rh-) & Chart
What is the rarest blood type or group in the world (on earth)? Blood is classified into groups using the letters A, B, C and O. In addition, the Rhesus factor characteristic, which can be positive (Rh+) or negative (Rh-) is also marked in the groups. In total there are 8 groups of blood. But … Read more