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Old October 23 2013, 03:03 AM   #9
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Re: Did the Xindi all evolve on 1 planet?

The Johnson wrote: View Post
That episode is the one where they claim each planet can only have 1 sentient species.
IIRC, they say that most planets whose inhabitants get to the warp stage of civilization only have one fully sentient species, and for the same reason we Terrans no longer have neanderthals: different tribes tend not to mix too nicely in the prehistoric stage.
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