[Borodog]

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What is the differnece between micro and macro evolution? If micro evolution produces changes within populations what prevents macro evolution?

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It's partly a matter of scale. Larger changes become exponentially (that one's for you, borodog) more difficult to achieve that miniscule changes,

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Large changes are simply accumulations of small changes.

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especially when multiple concurrent changes in structure or function are required.

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Required by whom?