Class 9 Biology MCQs (Grade 9) From Textbook

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Class 9 Biology MCQs – Certification Test 408

Pulmonary and Systemic Circulation Quiz (Question 408) – App & e-Book Download

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MCQ: 408

The time for atrial systole in one heartbeat is

  1. 0.7 seconds
  2. 0.1 seconds
  3. 0.3 seconds
  4. 0.4 seconds

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