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O Level Biology Cerification Guide: Certification Test 419

GCE O Levels Biology MCQ App & e-Book: MCQ 419

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MCQ: 419

Use of non-fossil fuel in factory may

  1. help in lesser air pollution
  2. increase pollution due to chimney fumes when fossil fuel is burnt
  3. lower the air quality in densely populated areas
  4. increase land pollution
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