O Level Biology MCQs – Certification Test 1509

Pollution: Sewage as Cause Trivia (Question 1509) – App & e-Book Download

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MCQ 1509: Foul smelling gases include:

Hydrogen Sulfide (H₂S) only
Ammonia (NH₃)
Carbon dioxide (CO₂) only
Hydrogen Sulfide (H₂S) and Ammonia (NH₃)

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