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Q&A How can the Progenitors oxygenate a world?

The Progenitors are an ancient race of almost infinite technological sophisitication, who mysteriously vanished millions of years ago for no good reason (I don't like TV Tropes, but you are welcome...

1 answer  ·  posted 6y ago by kingledion‭  ·  last activity 6y ago by kingledion‭

Question atmosphere planets microorganisms