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B
It pumps blood to the lungs more often, so blood is better oxygenated.
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C
It separates oxygenated and deoxygenated blood.
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D
It lowers blood pressure and the threat of heart attacks.
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E
It supplies the brain with more blood for cognition.
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Solution
The correct option is C It separates oxygenated and deoxygenated blood. In the case of four-chambered heart, there are two atria and two ventricles. The type of blood circulation in such type of heart is called as double circulation, including pulmonary and systemic circulation. The blood enters twice through the heart in this cycle, which prevents the deoxygenated and the oxygenated blood from getting mixed and the circulation is maintained properly.
Thus, the correct answer is option 'It separates oxygenated and deoxygenated blood'.