Irreducible complexity (IC) is an argument by proponents of intelligent design that certain biological systems are too complex to have evolved from simpler, or "less complete" predecessors, through natural selection acting upon a series of advantageous naturally occurring, chance mutations.[1] The argument is central to intelligent design, and is rejected by the scientific community at large,[2] which overwhelmingly regards intelligent design as pseudoscience.[3] Irreducible complexity is one of two main arguments used by intelligent design proponents, the other being specified complexity.
...Evolutionary biologists have demonstrated how such systems could have evolved,[6][7] and describe Behe's claim as an argument from incredulity.[8] In the 2005 Kitzmiller v. Dover Area School District trial, Behe gave testimony on the subject of irreducible complexity. The court found that "Professor Behe's claim for irreducible complexity has been refuted in peer-reviewed research papers and has been rejected by the scientific community at large."