What is Respiration Learning App (Android & iOS) | O Level Biology Quiz e-Book PDF
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O Level Biology MCQs – Certification Test 644

What is Respiration Quiz (Question 644) – App & e-Book Download

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MCQ 644: Stimulus for breathing is:

  1. lack of oxygen in blood
  2. excess of carbon dioxide in blood
  3. contraction of alveoli
  4. diaphragm movements

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