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Which of these is not one of the primary gases found in Earth's atmosphere? helium nitrogen oxygen carbon dioxide
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Which of these is not one of the primary gases found in Earth's atmosphere?

helium
nitrogen
oxygen
carbon dioxide

User Leoverload
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2 Answers

4 votes
The answer should be helium

User Questiondude
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3 votes
The answer is Helium
User UnderscoreC
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