Multiple choice

There are ______ blood groups.

  1. 3

  2. 4

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ABO blood grouping system classifies human blood into four main types: A, B, AB, and O. This classification is based on the presence or absence of A and B antigens on red blood cells. Type A has A antigens, Type B has B antigens, Type AB has both, and Type O has neither.

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