Drift

... occurred, no single genome change resulted in a "speciation event" that created a new species. And the genome must first be already drifting in that direction or else such morphological change is impossible. In the peacock example we can say that the peacocks are aroused by the direction ...

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... have a Common Ancestor. Why do they look different now? Evolution. Natural Selection is one mechanism of evolution, and others (such as genetic drift) could also be part of that mechanism for evolutionary change from their common ancestor.

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... offspring the entire population no longer chooses to pair-up together. Or a population that became isolated from another can experience genetic drift that forces them forever apart. Speciation is a process where a population so much changes from the population they once were that they have gone ...

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... offspring the entire population no longer chooses to pair-up together. Or a population that became isolated from another can experience genetic drift that forces them forever apart. In some cases speciation happens very slowly by taking small learning steps, one gene or epigentic switching change ...

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... or they will not mate as a rule (and of course there are always rare exceptions). So in the evolution model because there is constant slow genetic drift--it's just a case of defining when they became birds. In light of the news though, they need to find a new common ancestor. And it is nice to ...

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