D. Answer the following questions in brief.
1. What is breathing?
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the process of taking air into and expelling it through the lungs.
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Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly to bring in oxygen and flush out carbon dioxide. ... The body's circulatory system transports these gases to and from the cells, where "cellular respiration" takes place.
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