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What two gases together make up about 99% of Earth's atmosphere? a. Carbon dioxide and nitrogen A: Nitrogen and oxygen B: Nitrogen and helium C: Argon and oxygen D: Trace gases and nitrogen
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What two gases together make up about 99% of Earth's atmosphere? a. Carbon dioxide and nitrogen

A: Nitrogen and oxygen
B: Nitrogen and helium
C: Argon and oxygen
D: Trace gases and nitrogen

User Klaas
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1 Answer

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2 votes
A: Nitrogen and Oxygen
User Dbajgoric
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