Class 9 Biology Study App | Human Heart Trivia e-Book PDF

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Class 9 Biology MCQs – Certification Test 73

Human Heart Trivia (Question 73) – App & e-Book Download

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MCQ 73: The right and left atria are considered as:

  1. lower thick-walled chambers
  2. upper thick-walled chambers
  3. lower thin-walled chambers
  4. upper thin-walled chambers
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