IGCSE O Level Biology Certification Exam Tests
IGCSE O Level Biology Practice Test 263
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MCQ 1311: Hydrogen sulfide (H2S) and ammonia (NH3) are produced from
MCQ 1312: Oesophagus is also called as
MCQ 1313: Diarrhea is caused due to
MCQ 1314: In respiration oxygen debt refers to the amount of
MCQ 1315: In ecosystem ,Pupa survives through
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