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Class 9 Biology Cerification Guide: Certification Test 73

Human Heart Notes App & e-Book: MCQ 73

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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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Human Heart Cerification Guide: Class 9 Biology App & eBook Notes

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