“The problem is this: the spaces we have available to live in are too small to survive in for three thousand years. The main problem is the differential rates of evolution between the various orders of life confined to the space. Bacteria generally mutate at a rate far faster than larger species, and the effect of that evolution on the larger species is eventually devastating. This is one cause of the dwarfism and higher rates of extinction seen in island biogeography studies. And we are an island if there ever was one. And this Iris is not an Earth twin, nor an Earth analog. It is a Mars
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