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Blood Groups MCQs App Download | Class 9 Biology MCQs Apps (iOS & Android)

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Blood Groups MCQs App Download & e-Book | 1403

MCQ: 1403

The difference between blood groups Rh-positive and Rh-negative are based on antigens known as

  1. positive factors
  2. O factors
  3. AB factors
  4. Rh factors

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