Blood group compatibility plays a crucial role in safe blood transfusions. People with O negative (O−) blood are universal donors, meaning their blood can be given to anyone, but they can only receive from O− donors. AB positive (AB ) individuals are universal recipients, as they can receive blood from all groups. Those with O positive (O ) can donate to any Rh-positive group (O , A , B , AB ), while A negative (A−) and B negative (B−) can donate to their respective groups and AB types. Similarl

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