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RE: Is biological evolution a ball rolling up a hill all by itself?

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oldmariner (55)in #evolution • 8 years ago (edited)

Biologist's definition of species is just that. When the two cannot mate then they are different species. Speciation is the first step as the decedents of the new species become/evolve increasingly different from the original.

8 years ago in #evolution by oldmariner (55)
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