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Order these five gases that occur in the troposphere from most abundant to least abundant: Rn, CO2, CO, N2, Ar and O2.
1. N2, O2, Ar, CO2, CO, Rn
2. O2, CO2, N2, CO, Rn, Ar
3. N2, CO2, CO, O2, Ar, Rn
4. N2, Ar, O2, Rn, CO, CO2
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