>
> >Species are fixed, separate from each other and form a closed natural
> unit.
>
> Actually, this is frequently not exactly true.  There is regular allele
> transfer between many species.


>That species are a natural entity and subspecies are an entity created by
humans

Actually, species are also solely a human construct.  In nature, there are
populations, which humans classify into species.  But the lines that humans
use to differentiate species are often not clear cut at all, especially at
the genetic level.

-- 
Randy Oliver
Grass Valley, CA
ScientificBeekeeping.com

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