IGCSE O Level Biology Practice Tests
IGCSE O Level Biology Online Tests
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MCQ 1: Gaseous pollutants may be carried to other countries to
MCQ 2: Gaseous pollutants include
MCQ 3: Death of fish in lakes and rivers in some countries has been attributed to
MCQ 4: Biological decay, forest fires and volcanic eruptions are example of
MCQ 5: Aluminum (Al) salts may become fatal to fish if allowed to react with
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