Explanation:

The atmosphere of Venus is made up almost completely of carbon dioxide. It also includes small doses of nitrogen and clouds of sulfuric acid.

It also averages about 1% water vapor. Mars' atmosphere however is 95% carbon dioxide, 3% nitrogen, 1.6% argon, and it has traces of oxygen, carbon monoxide, water, methane, and other gases, along with a lot of dust.

Saturn is approximately 75% hydrogen and 25% helium with traces of other substances like methane and water ice. Saturn's atmosphere, although similar to Jupiter's, is much less interesting to look at from a distance.