No, it has only one atmosphere.
Yes
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There is no relation.
Atmospheres cannot be converter to milliliters. Atmospheres are a unit of pressure based on the Earth's atmosphere. Milliliters are a unit of volume, otherwise known as a cubic centimeter.
Venus, Earth and Mars.
Earth has a thin atmosphere. Saturn has a thick atmosphere.
Of course the Earth has an atmosphere- that is the air that you are breathing. However, the Moon does not.
Oxygen
Mantle
The principal gas in the Venusian atmosphere is carbon dioxide. This is also a minor component of the atmospheres of Earth and Mars.
All the planets in our Solar System have atmospheres, except for Mercury, which only has minute traces of gases.
Venus, Earth, Mars, and Triton (Neptune's largest moon) have carbon dioxide in their atmospheres.