The lower two chambers of heart are known as *
A)ਆਰੀਕਲ . Atria
B) ਵਾਲਵ . Valves
C) ਸ਼ਿਰਾਵਾਂ . Veins
D) ਵੈਂਟਰੀਕਲ . Ventricles
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