“Since natural selection requires a function to select, an irreducibly complex biological system, if there is such a thing, would have to arise as an integrated unit for natural selection to have anything to act on.”
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Other Michael Behe Quotes
In the 19th century the anatomy of the eye was known in great detail and the sophisticated mechanisms it employs to deliver an accurate picture of the outside world astounded everyone who was familiar with them.
Michael Behe 
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In order to say that some function is understood, every relevant step in the process must be elucidated.
Michael Behe
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It was only about sixty years ago that the expansion of the universe was first observed.
Michael Behe
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