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To: central_va
central_va: "I see no evidence where one species begets another different.
There are no crossover croca-horse fossils."

Of course not, and nobody ever said there is.
But we are dealing here with a precise scientific definition of the word "species" -- what is it?

For example, Polar Bears and Brown Bears were classified scientifically as separate "genera" but recently got changed to just different "species" of the same genus.
One reason: they do occasionally mate and produce viable hybrid offspring, sometimes called a "groler-bear".

Point is: most of these changes take place over long periods of time, generation by generation, and so it is not possible to pinpoint precisely when one sub-species has changed just enough to be considered a new species, or one species changed just enough to be called a new genus, etc.

Groler-bear:

118 posted on 04/30/2013 2:22:59 AM PDT by BroJoeK (a little historical perspective....)
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To: BroJoeK
most of these changes take place over long periods of time, generation by generation, and so it is not possible to pinpoint precisely when one sub-species has changed just enough to be considered a new species, or one species changed just enough to be called a new genus, etc.

Funny how mythical crossover species never seem to form fossils. The appearance of new species seems to be a step function not an analog process....

141 posted on 04/30/2013 8:41:37 AM PDT by central_va (I won't be reconstructed and I do not give a damn.)
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