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Oxygen Makes Up Almost 21 Percent of Our Present Atmosphere

question 76

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Oxygen makes up almost 21 percent of our present atmosphere. It is essential to modern life for two reasons. First, oxygen is what we must inhale so that our bodies can 'burn' (oxidize) food, releasing energy to our cells. Second, we depend on oxygen for protection from the ultraviolet radiation from the sun that constantly bombards our planet. Harold V. Thurman, Essentials of Oceanography, 5th. ed.


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