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a bare planet
Hardly an apt description of the cooling earth, churning with all kinds of complex molecules, bubbling with volcanic activity, rained on by fires and meteors from the sky.
It was a very busy place.
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Yea, like Mars with more water.
Does Mars have volcanic activity? Actually Mars used to have a lot of liquid water and I wouldn't be surpised if evidence is eventually found that life got started on Mars, a long time ago. If there were any Martin microbes, however, they lost their habitat ages ago, when the planet dried up.