God didn't do it. We can just drop that.
It seemed to me that panspermia was over complicating things; but, I see now how it may just be considering other possible sources if the conditions on earth were uncertain. Also, if conditions were better on another place (like mars or wherever not too far away) before earth was viable, panspermia could allow more time for life to start. It could have began elsewhere while the earth was still a ball of flaming rocks only to show up later when conditions were better and be a little ahead of the game.
Although, the majority of the diversity we see now evolved in the 500M+ years since the Cambrian 'explosion' leaving an easy couple of billion years of time to get going prior to that...
It seemed to me that panspermia was over complicating things; but, I see now how it may just be considering other possible sources if the conditions on earth were uncertain. Also, if conditions were better on another place (like mars or wherever not too far away) before earth was viable, panspermia could allow more time for life to start. It could have began elsewhere while the earth was still a ball of flaming rocks only to show up later when conditions were better and be a little ahead of the game.
Although, the majority of the diversity we see now evolved in the 500M+ years since the Cambrian 'explosion' leaving an easy couple of billion years of time to get going prior to that...
