IGCSE O Level Biology Competitive Exam MCQs – Practice Test 5 (Chapter 15)
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MCQ 21: Over-breathing is a symptom of:
MCQ 22: Too little carbon dioxide (CO2) in lungs leads to:
MCQ 23: Stimulus for breathing is:
MCQ 24: Respiration is a/an:
MCQ 25: In respiration ultimate source of energy is:
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