How is it determined that an organism is a new species?

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Offline thedoc

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Stacey Rollings asked the Naked Scientists:
   
How is it determined that an organism is a new species? I had heard that inability to interbreed was one factor, but wolves and dogs can interbreed, as well as horses and donkeys, so that can't be it.

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What do you think?
« Last Edit: 20/03/2014 02:30:01 by _system »