O Level Biology Study App | Human Biology MCQ e-Book PDF
O Level Biology MCQs (O Level) From Textbook

O Level Biology MCQs – Certification Test 591

Human Biology MCQ (Question 591) – App & e-Book Download

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MCQ 591: Over-breathing is a symptom of:

  1. less oxygen
  2. excess oxygen
  3. excess carbon dioxide
  4. excess carbon monoxide

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