Gas exchange and lung (lung), the lungs are organs that are shaped like bags. In vertebrate that lived on land is the only way to open the lung bag 1 or more bags of some parts of the lung epithelium, and per, it tube consecutively and live together as groups, which increases the surface area for the exchange of gases between the air inside the lungs and blood vessels, but the lungs look like socks to limit the ability of the lungs to Exchange oxygen and carbondioxide on external environment when breathing.
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