Some features of living cells exhibit
irreducible complexity meaning that they function only if all their parts are present in good working order at the outset. For example, a mousetrap consists of several parts which work together to catch a mouse; if any part is missing or defective, the mousetrap fails to work at all. Similarly, the biochemistry of light detection requires complex interactions among many different molecules, each performing a very specialized job.
According to Lehigh University biochemist Michael Behe there is no imaginable way that the necessary combination of molecules could be built up piecemeal, as [the theory of evolution]? requires; either they are all present, or the process does not work.
See: intelligent design
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