Class 10 Biology MCQs App Download | Exchange of Gases in Humans MCQs e-Book PDF
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Class 10 Biology MCQs – Certification Test 1770

Exchange of Gases in Humans MCQs (Question 1770) – App & e-Book Download

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MCQ 1770: Nostril has mucous which is responsible for:

  1. filtering of air
  2. cleaning of air
  3. moisten the air
  4. clear the air

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