[samtheman]

The study authors believe that Earth’s early microbial life helped to stabilize the planet’s climate, while any life that might have existed on the nearby, similarly rocky planets Venus and Mars failed to do so.

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Don’t forget the lack of magnetic field on Mars. No magnetic field (or one that is extremely weak), and the solar wind blows away the atmosphere. Which happened. And is still happening, on Mars.

[Trumpinator]

For there to have been an atmosphere on Mars - guessing - means that it must have had a magnetic sphere once. The iron core stopped rotating in the center of Mars as the planet’s magma solidified?