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Topic: Science
Number of pages / Number of words: 3 / 783
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It is the most abundant element at the earth’s surface, found in various ores, gems, and also in living organisms. Oxygen makes up 21% of the earth’s atmosphere, and also makes up 46% of the earth’s mass. Approximately two-thirds of the human body and nine-tenths of water is made of the element...


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Oxygen is also important because it is involved in the process of metabolism. Organisms derive their energy from this process, making oxygen essential to life in yet another way. The ozone, which products the earth from dangerous UV rays, is made up of O3.

Oxygen is also important in the field of medicine...


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