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O Level Biology Study Guide: Certification Test 486

What is Respiration MCQs App Download & e-Book - 486

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MCQ: 486

Blood entering the lungs contain very

  1. little oxygen (O2) only
  2. high carbon dioxide (CO2) only
  3. low carbon dioxide (CO2)
  4. little oxygen (O2) and high carbon dioxide (CO2)
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