Science, asked by thrisha12, 10 months ago

why humans have a different blood groups.

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Answered by dikshu120

3

Answer:

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. There are four main blood types. Blood type A is the most ancient, and it existed before the human species evolved from its hominid ancestors.

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