Answer :
Final answer:
Type O negative blood is classified as a universal donor due to its lack of A and B antigens, allowing it to be safely transfused into individuals with different blood types.
Explanation:
Type O negative blood is classified as a universal donor because it lacks both A and B antigens, which reduces the risk of causing reactions when transfused into individuals with different blood types. This feature allows individuals with O-negative blood to donate to recipients with diverse blood groups without triggering an immune response.
For example, when type O blood is transfused into a person with type A or B blood, the absence of antigens in type O blood reduces the chances of rejection. In contrast, individuals with AB positive blood are considered universal recipients due to the absence of anti-A or anti-B antibodies, enabling them to receive blood from donors with different blood types.
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