Of the four main human blood types using the ABO system, the largest percentage of the U.S.population is made up of:

Name: Of the four main human blood types using the ABO system, the largest percentage of the U.S.population is made up of:
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Type O is the most common blood type among the U.S. population, with around 45% of people in the U.S. having this blood type. It is often referred to as the "universal donor" type for transfusions of red blood cells.

Of the Four Main Human Blood Types Using the ABO