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  3. 7th Class
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7th Class Science Sample Paper Science Olympiad Model Test Paper-5

  • question_answer
    Our heart has four compartments called chambers. The upper two chambers are called _____ and the lower two chambers are called _____.

    A) atria, ventricles

    B) ventricles, atria

    C) pulmonary artery and pulmonary vein

    D) aorta, vena cava

    E) None of these

    Correct Answer: A

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