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Dec 3, 2017 at 21:27 comment added Henning M. "Decreasing genetic diversity" should be the main argument. Without it you won't get a single differentiated species but stemlines which are only related to each other depending on their last common ancestor. This may depend on how often genocides and other catastrophs happen.
Jul 12, 2016 at 20:42 history edited Obie 2.0 CC BY-SA 3.0
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Jul 23, 2015 at 17:44 vote accept Ayelis
Jul 23, 2015 at 17:44 comment added Ayelis This is a well researched answer. Additionally, "Decreasing genetic diversity" was the last thing I'd have expected someone to say. Conservation of the gene pool makes a lot of sense, especially in a universe filled with extraplanetary and planetary sources of radiation and other mutagens. Good answer!
Jul 20, 2015 at 18:24 history edited Obie 2.0 CC BY-SA 3.0
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Jul 20, 2015 at 17:26 history answered Obie 2.0 CC BY-SA 3.0