Compared to mars, our atmosphere's is better to maintain a warm, livable temperature.
transparency
layer structure
thickness
age

The most appropriate answer is thickness. Earth's atmosphere is thicker than Mar's atmosphere. This could be due to the fact that the earth is more massive amd can hold a thicker atmosphere. The Martian atmosphere is composed mostly of carbon dioxide. The atmosphere is thin and cold so liquid water would evaporate or freeze.

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