What is the significance of the atmosphere on earth as compared to other planets?

The significance of the atmosphere on earth as compared to other planets are:

1. The earths atmosphere contains 21% oxygen, 78% nitrogen with traces of carbon dioxide, water vapour and other gases. This allows the existence of life on earth.
2. It extends up to 1600 km.
3. Atmosphere acts as a blanket of air protecting us from the harmful ultraviolet rays of the sun.
4. It retains the heat radiated from the earth's surface.