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Earth's atmosphere is unique among the planets because it contains a large amount of ___________. A) oxygen B) helium C) methane D) carbon dioxide
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Earth's atmosphere is unique among the planets because it contains a large amount of ___________. A) oxygen B) helium C) methane D) carbon dioxide

User Jankos
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The answer is A i had it on a test.

Step-by-step explanation:

User Arockia Nirmal
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The answer is A. Oxygen
User Thomas Calc
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