IGCSE O Level Biology Practice Tests
IGCSE O Level Biology Online Tests
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MCQ 1: Non-toxic, unreactive chemicals used as cooling agents in refrigerators are known as
MCQ 2: Risks of skin cancer is increased if
MCQ 3: Upon entering through stomata, the leaves get damaged and plant dies. This pollutant is
MCQ 4: Volcanic eruptions, biological decay and forest fires releases
MCQ 5: Increased melting of ice glaciers may be a result of
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