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Oxygen makes up about _____ percent of Earth's atmosphere. A. 100% B. 78% C. 21% D. 1%
Oxygen makes up about 21% percent of Earth's atmosphere.
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Expert answered|asero1010|Points 4177|
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Asked 1/22/2013 10:18:04 AM
Updated 5/28/2014 1:31:38 PM
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This answer has been confirmed as correct and helpful.
Edited by Janet17 [5/28/2014 1:31:30 PM], Confirmed by Janet17 [5/28/2014 1:31:38 PM]
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