The four blood groups as we know them today are the result of 40,000 years of evolution of the human species.The man, who was originally exclusively a hunter (group O), evolved, first (about 20,000 years ago) learning to cultivate the land and feed on its fruits (group A) and subsequently (about 15,000 – 10,000 years ago) , on the heights of the Himalayas, becoming a nomad and taking care of livestock (group B). Finally, about 1,000 years ago, the AB group was formed, the only one not to be...
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