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General Science and Technology Quiz
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How many different blood groups are there among Humans?
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A
4
💡 Explanation:
There are 4 main blood groups in the ABO system: A, B, AB, and O. Each can be Rh-positive or Rh-negative, creating 8 total types, but the fundamental groups are 4. This is the standard classification used worldwide for blood typing and transfusion compatibility.