O Level Biology MCQs – Certification Test 486

What is Respiration MCQs (Question 486) – App & e-Book Download

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MCQ 486: Blood entering the lungs contain very:

little oxygen (O₂) only
high carbon dioxide (CO₂) only
low carbon dioxide (CO₂)
little oxygen (O₂) and high carbon dioxide (CO₂)

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O Level Biology MCQs App & e-Book – What is Respiration Study Guide

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