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Class 9 Biology MCQs (Grade 9) From Textbook

Class 9 Biology MCQs – Certification Test 33

Blood Groups Trivia (Question 33) – Study App & e-Book Download

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MCQ 33: The Rh-blood group system was discovered by Karl Landsteiner in:

  1. 1930s
  2. 1940s
  3. 1950s
  4. 1960s
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Class 9 Biology Trivia App & e-Book – Blood Groups Admission Tests

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