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To: CutePuppy

It wouls seem prudent for a species to expand as far as possible when all it takes for a mass extinction is for one of those really big supervolcanos to go off , or when one meteor could set a civilization back centuries.


39 posted on 04/18/2007 10:21:19 PM PDT by piasa (Attitude Adjustments Offered Here Free of Charge)
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To: piasa
It wouls seem prudent for a species to expand as far as possible ...

As species, human race has done exactly that. However, some subspecies like homo liberalis, particularly in some geographical areas of North America, do concentrate in high density population areas and mostly expand population growth by infusion (importing population) instead of expanding by diffusion (by resettling and spreading out onto new territory).

51 posted on 04/18/2007 11:26:22 PM PDT by CutePuppy (If you don't ask the right questions you may not get the right answers)
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