The correct answer is "By exchanging oxygen and carbon dioxide."
Explanation: The circulatory and respiratory systems work closely together to ensure that oxygen is delivered to the body's tissues and that carbon dioxide, a waste product of metabolism, is removed. The respiratory system facilitates the intake of oxygen when we breathe in, which then diffuses into the bloodstream in the lungs. The circulatory system then transports this oxygen-rich blood to cells throughout the body. Simultaneously, carbon dioxide produced by the cells is transported back to the lungs via the circulatory system, where it is expelled from the body when we exhale. This vital exchange of gases is essential for cellular respiration and overall metabolism.
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