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How do groupings of blood types correlate with certain parts of the world?

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How do groupings of blood types correlate with certain parts of the world?

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Extensive mapping was done in the first part of the 20th century on aboriginal populations. Blood group O was highest in the Americas, and B in Africa. The presence of blood groups in specific areas may have been influenced by prehistoric epidemics and certainly by population migration. Now, there are only small aboriginal populations left and a large enough sampling cannot be obtained. 9. In your opinion, is it possible to think that blood, specifically human blood, can and will eventually be broken down into many additional subsets rather than just A, B, AB, O? Are you aware of scientific studies done where, let’s say, a person that has been able to better fight off a particular disease or cancer, has had their blood transfused into a person that is, for lack of a better word, dying from a particular disease? In other words, is it possible that the antibodies (or some other blood disease fighter) that a particular person has “trained” in their own body to be passed on to help “teach”

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