Class 8 Science Learning App Download | Human Activities and Ecosystem MCQ e-Book PDF
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Class 8 Science MCQs – Certification Test 467

Human Activities and Ecosystem MCQ (Question 467) – Learning App & e-Book Download

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MCQ 467: Maintenance of oxygen and carbon dioxide in air is done by:

  1. forests
  2. humans
  3. animals
  4. global warming
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Class 8 Science MCQ App & e-Book – Human Activities and Ecosystem Study Material

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