IGCSE O Level Biology Practice Tests
IGCSE O Level Biology Online Tests
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MCQ 1: Lives of organisms in ecosystem become threatened due to
MCQ 2: Reaction between oxides of nitrogen (N2) and oxygen (O2) results in
MCQ 3: Incomplete burning of fuel causes
MCQ 4: Process by which harmful substances are added to environment is called as
MCQ 5: Reaction between sulfur dioxide and oxygen results in
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