Meaning of assimilation?
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Oxygen-deficient, carbon dioxide-rich blood returns to the right side of the heart through two large veins, the superior vena cava and the inferior vena cava. Then the blood is pumped through the pulmonary artery to the lungs, where it picks up oxygen and releases carbon dioxide.
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Answer:
the absorption and digestion of food or nutrients by the body or any biological system
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