With the exception of water vapor, ________ is the most plentiful of the variable gases in the atmosphere. A) argon B) carbon dioxide C) sulfur dioxide D) ozone E) carbon monoxide

With the exception of water vapor, ________ is the most plentiful of the variable gases in the atmosphere.
A) argon
B) carbon dioxide
C) sulfur dioxide
D) ozone
E) carbon monoxide

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