IGCSE O Level Biology Certification Exam Tests
IGCSE O Level Biology Practice Test 169
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MCQ 841: Nitrates (NO3-1) and phosphates (PO4-3) reach underground water with
MCQ 842: In excretion process ultrafiltration retains
MCQ 843: Mammals do not produce
MCQ 844: Process of using natural bacteria in mining industry is known as
MCQ 845: From the root hair cells, the water travels through the
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