Human Heart Trivia App Download | Class 9 Biology Trivia e-Book PDF
Class 9 Biology MCQs (Grade 9) From Textbook

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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Human Heart Trivia App & e-Book – Class 9 Biology Learning Guide

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