IGCSE O Level Biology Certification Exam Tests
IGCSE O Level Biology Practice Test 137
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MCQ 681: In any ecosystem, the ultimate source of energy is
MCQ 682: If heat loss center is activated in hypothalamus, the control mechanism include all, but
MCQ 683: Each nephron consists of
MCQ 684: Number of alkaloids in opium are at least
MCQ 685: Growth of bacteria in hair follicle is prevented through
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