> I wouldn't say the planet "barely" supported life before the oxygenation event. Otherwise we wouldn't have as much fossil evidence as we have. I believe you'

> I wouldn't say the planet "barely" supported life before the oxygenation event. Otherwise we wouldn't have as much fossil evidence as we have. I believe you're talking about Earth, and the person you're responding to was talking about Mars. At least I don't think Mars had an oxygenation event or fossils?