Multiple choice general knowledge science & technology

How many different blood groups are there among Humans?

  1. 4

  2. 5

  3. 9

  4. 6
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A Correct answer
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.

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