Class 9 Biology e-Book's MCQs - Complete
Pulmonary and Systemic Circulation Quiz App Free Download & e-Book - 380
Apps:
MCQ:
Considering the cardiac cycle, the sound "dub" is produced when the
- ventricles relax
- ventricles contract
- atria contracts
- atria relax
a
Class 9 Biology App & e-Book Tests PDF Download
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9th Grade Biology MCQs eBook Download
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