IGCSE O Level Biology Competitive Exam MCQs – Practice Test 13 (Chapter 7)
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MCQ 61: Exhaust motor vehicle is the main source of:
MCQ 62: Death of fish in lakes and rivers in some countries has been attributed to:
MCQ 63: Smoke and fog combine to form:
MCQ 64: Narrow tolerance of oxygen (O2) is found in:
MCQ 65: Leukemia can be cured through:
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