IGCSE O Level Biology MCQs – Practice Test 1 (Chapter 17)
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MCQ 1: The "lub" sound is produced after the:
MCQ 2: Special kind of protein containing iron is called as:
MCQ 3: In the cardiac system, systole means:
MCQ 4: Pulmonary veins carry:
MCQ 5: Organ transplant fails if the:
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