IGCSE O Level Biology MCQs – Practice Test 16 (Chapter 7)
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MCQ 76: If lead accumulation occurs for long in the body, the outcomes may include:
MCQ 77: Hydrogen sulfide (H2S) and ammonia (NH3) are produced from:
MCQ 78: An inversion of smoke escape occurs if:
MCQ 79: Compounds which tend to accumulate in bodies are:
MCQ 80: Risks of skin cancer is increased if:
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