Class 9 Biology MCQs (Grade 9) From Textbook

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Class 9 Biology MCQs – Certification Test 297

Human Heart Trivia (Question 297) – App & e-Book Download

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MCQ: 297

The function of pericardial fluid is to

  1. reduce friction
  2. increase friction
  3. increase supply of oxygen
  4. increase supply of water

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