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It is therefore a state of interacting components that could not function without all its parts. In particular, the term is used by proponents of [[Intelligent Design]] to argue that irreducibly complex biological systems cannot evolve.  

It is therefore a state of interacting components that could not function without all its parts. In particular, the term is used by proponents of [[Intelligent Design]] to argue that irreducibly complex biological systems cannot evolve.  

The most commonly used examples of irreducibly complex biological systems are the human compound eye, the [[blood clotting cascade]], and the bacterial [[flagellum]].

The most commonly used examples of irreducibly complex biological systems are the human compound eye, the [[blood clotting cascade]], and the bacterial [[flagellum]]. However, not all parts of the blood clotting cascade are necessary, as one Behe lists is missing in whales, and different animals have different numbers of clotting steps. The evolution of the compound eye is now well understood, and it has been found that the basal body of the flagellum

is similar to a needle-like structure some bacteria use to inject toxins into eukaryotic cells.

Kenneth R. Miller describes hypothetical precursors to the flagellum's being used as ionic channels within [[bacteria]], known as the ''Type III Secretory System''.<ref>[http://www.millerandlevine.com/km/evol/design2/article.html The Flagellum Unspun]</ref>  However, Professor Behe counters that Miller's criticism of his work is flawed. <ref>http://www.arn.org/docs/behe/mb_trueacidtest.htm</ref>  Critics, including biology professor John McDonald, have countered Behe's toy model, the mouse trap, used to illustrate the concept. McDonald produced examples of how he considered the mousetrap to be "easy to reduce", eventually to a single part.<ref name=trap>[http://udel.edu/~mcdonald/mousetrap.html A reducibly complex mousetrap] (graphics-intensive, requires [[JavaScript]])</ref> <!--Critics consider that most, or all, of the examples were based on misunderstandings of the workings of the biological systems in question, and consider the low quality of these examples excellent evidence for the argument from ignorance.-->However, Professor Behe disputes the criticism of John McDonald. <ref>http://www.arn.org/docs/behe/mb_mousetrapdefended.htm</ref>

Kenneth R. Miller describes hypothetical precursors to the flagellum's being used as ionic channels within [[bacteria]], known as the ''Type III Secretory System''.<ref>[http://www.millerandlevine.com/km/evol/design2/article.html The Flagellum Unspun]</ref>  However, Professor Behe counters that Miller's criticism of his work is flawed. <ref>http://www.arn.org/docs/behe/mb_trueacidtest.htm</ref>  Critics, including biology professor John McDonald, have countered Behe's toy model, the mouse trap, used to illustrate the concept. McDonald produced examples of how he considered the mousetrap to be "easy to reduce", eventually to a single part.<ref name=trap>[http://udel.edu/~mcdonald/mousetrap.html A reducibly complex mousetrap] (graphics-intensive, requires [[JavaScript]])</ref> <!--Critics consider that most, or all, of the examples were based on misunderstandings of the workings of the biological systems in question, and consider the low quality of these examples excellent evidence for the argument from ignorance.-->However, Professor Behe disputes the criticism of John McDonald. <ref>http://www.arn.org/docs/behe/mb_mousetrapdefended.htm</ref>