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There are various hypothesis being tested on how life could had originated. These tend to be independent with each other, because it's easier to work like that.
>Why couldn't life be created, then a couple of billion years later, life was created again, which added diversity to life on earth?
If you have a barren planet and a single lifeform that is efficient enough to survive and keep expanding, it would eventually reach all places and by the simple act of living, transform the original barren planet. The second life you talk should've originated between the origin of the first life and the time it took for this life to reach the second origin.
