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There is no evidence of significant amounts of free oxygen on planets other than Earth. Oxygen is produced on Earth through photosynthesis by plants and other organisms. Different planets have different compositions of gases in their atmospheres, such as carbon dioxide, nitrogen, and methane.
Differentiation occurred in other inner planets, besides Earth.
Earth is the only planet with abundant oxygen in its atmosphere because it has a unique combination of factors that allow for the presence of oxygen-producing life forms, such as plants. Other planets may lack oxygen due to their distance from the sun, composition of their atmosphere, or absence of life forms that can produce oxygen through photosynthesis.
Earth is the only known planet with an oxygenated atmosphere.
Liquid water. All else is incidental.
There is no other known planet in our solar system that has a significant amount of oxygen in its atmosphere like Earth. However, there are exoplanets outside our solar system that have been detected with oxygen present, but the conditions for life as we know it are yet to be confirmed on any of these planets.