That's a great question! Different blood
types are named because they have certain traits
that characterize the red blood cells. People
have a blood type that is determined by their
parents (through genetics; similar to some
people having brown eyes, while others have blue
eyes. AB blood is named that because it has the
traits of both A-type red blood cells and B-type
red blood cells. There is also O blood type,
means they have neither A or B type
characteristics. Blood types were first
identified in the early 1900's.
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