Chapter 7: IGCSE O Level Biology Exam Tests
IGCSE O Level Biology MCQs - Chapter 7
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MCQ 11: Problem of solid waste disposal can be reduced through
MCQ 12: Non-toxic, unreactive chemicals used as cooling agents in refrigerators are known as
MCQ 13: Lives of organisms in ecosystem become threatened due to
MCQ 14: If a substance accumulates in a body for a long time, it will be
MCQ 15: Most fertile layer of soil is
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