What is the oldest blood type?

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What Is The Oldest Blood Type?

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James Webb (2022, August 3.) What is the oldest blood type?
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Copyright 2022 James Webb
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That isn't correct with the research of O being a positive transfusion with canines, O being the oldest. A, B, than AB which makes a chronological sense to things.

lucasfisher
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Lmao, O type is the oldest and every other type falls under this, it’s why any blood type can receive O expect O -

silverfox