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

Class 9 Biology MCQ: Complete Course

Blood Groups MCQ App Download & e-Book | 639

MCQ: 639

The Rh-negative blood group of a person is based on

  1. presence of neutrophils
  2. absence of Rh factors
  3. presence of Rh factors
  4. presence of tubulin

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