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Ninety nine percent of the atmosphere is composed of _____ and _____.
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Ninety nine percent of the atmosphere is composed of _____ and _____.

User Dario Petrillo
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Answer:

78% nitrogen and 21% oxygen

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User Sher Mi
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12 votes

Answer:

Ninety nine percent of the atmosphere is composed of Nitrogen and Oxygen

User Jfarcand
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