Fantastic question! A blood type tells you what
kind of surface is on a particular person's red
blood cell. The structures on the surface of red
blood cell that determine blood type are called
antigens. If your red blood cells have type A
antigens, then you have type A blood. Type B
antigens = type B blood and if you have a
combination of both type A and B antigens then you
have type AB blood. If your red blood cells do not
have any antigens at all, then you have type O
blood. Humans and our close animal relatives the
apes (chimpanzees, bonobos and gorillas) all have
these same ABO antigens on our red blood cells.
Other animals have antigens on their red blood
cells that are different from humans and the apes,
so they have different types of blood (not the ABO
typing like we have).
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