Why does a human have different blood groups?
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Human blood types most likely came to exist to fend off infectious diseases. The incompatibility of some blood types, however, is just an accident of evolution. Blood type A is the most ancient, and it existed before the human species evolved from its hominid ancestors. ...
hope it helps you
Explanation:
in my opinion all are different
we are not same .....all have a different habit
so how we all got a same blood ....
hehe just for fun i type this
.
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