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In some cultures, blood types are linked to personality traits, a notion that lacks scientific backing. While the distribution of various blood types may differ among populations globally, the reasoning behind this distribution remains uncertain. Theories suggest that blood types may have evolved as a defense against bloodborne diseases or as a result of random genetic drift.
Lastly, it is important to note that blood type variations are not exclusive to humans. Other species have their unique antigens; for instance, dogs boast a staggering thirteen different blood types. This biological diversity highlights the complexity of blood type systems in the animal kingdom.