Irreducible complexity

thumb|Michael Behe believes that many aspects of life show evidence of design, using the mousetrap in an analogy disputed by others. Irreducible complexity (IC) is the argument that certain biological systems with multiple interacting parts would not function if one of the parts were removed, so supposedly could not have evolved by successive small modifications from earlier less complex systems through natural selection, which would need all intermediate precursor systems to have been fully functional. This negative argument is then complemented by the claim that the only alternative explanation is a "purposeful arrangement of parts" inferring design by an intelligent agent. Quotes Quotes are arranged alphabetically by author As the number of unexplained, irreducibly complex biological systems increases, our confidence that Darwin’s criterion of failure has been met skyrockets toward the maximum that science allows. Michael Behe, Darwin’s Black Box: The Biochemical Challenge to Evolution (1996), p. 39-40. The fine-tuning of the universe, about which cosmologists make such a to-do, is both complex and specified and readily yields design. So too, Michael Behe's irreducibly complex biochemical systems readily yield design. The complexity-specification criterion demonstrates that design pervades cosmology and biology. Moreover, it is a transcendent design, not reducible to the physical world. Indeed, no intelligent agent who is strictly physical could have presided over the origin of the universe or the origin of life. William A. Dembski, "The Act of Creation: Bridging Transcendence and Immanence", presented at Millstatt Forum, Strasbourg, France, 1998-08-10 Intelligent design is eminently falsifiable. Specified complexity in general and irreducible complexity in biology are within the theory of intelligent design the key markers of intelligent agency. If it could be shown that biological systems like the bacterial flagellum that are wonderfully complex, elegant, and integrated could have been formed by a gradual Darwinian process (which by definition is non-telic), then intelligent design would be falsified on the general grounds that one doesn't invoke intelligent causes when purely natural causes will do. In that case Occam's razor finishes off intelligent design quite nicely. The fact is that for complex systems like the bacterial flagellum no biologist has or is anywhere close to reconstructing its history in Darwinian terms. Is Darwinian theory therefore falsified? Hardly. I have yet to witness one committed Darwinist concede that any feature of nature might even in principle provide countervailing evidence to Darwinism. In place of such a concession one is instead always treated to an admission of ignorance. Thus it's not that Darwinism has been falsified or disconfirmed, but that we simply don't know enough about the biological system in question and its historical context to determine how the Darwinian mechanism might have produced it. Is Intelligent Design Testable — A Response to Eugenie Scott 2011-01-24 The Golden Spiral http://www.metanexus.net/magazine/tabid/68/id/2667/Default.aspx 2011-10-23 William A. Dembski, responding to Eugenie Scott's 2001-01-18 lecture at U.C. Berkeley, "Icons of Creationism: The New Anti-Evolutionism and Science" In Darwin's Black Box [1996], Professor Behe wrote that not only were there no natural explanations for the immune system at the time, but that natural explanations were impossible regarding its origin. However, Dr. Miller presented peer-reviewed studies refuting Professor Behe's claim that the immune system was irreducibly complex. … In fact, on cross-examination, Professor Behe was questioned concerning his 1996 claim that science would never find an evolutionary explanation for the immune system. He was presented with fifty-eight peer-reviewed publications, nine books, and several immunology textbook chapters about the evolution of the immune system; however, he simply insisted that this was still not sufficient evidence of evolution, and that it was not "good enough." Judge John E. Jones III, Opinion in Kitzmiller v. Dover Area School District, 20 December 2005, p. 78. When I say that all forms of life have characteristics of irreducible complexity, I am emphasising a fundamental point: life cannot be reduced to a simple sum of its basic parts. Let's take a living organism: even in its simplest forms, there are structures and processes that only work if all the components are present and operating together. It's a bit like an orchestra: if even one essential instrument is missing, the harmony is broken. In biology, this is even more radical: if a single cog in the vital mechanism is missing, life cannot exist. This concept contrasts with the idea that life can be explained solely as the result of tiny random steps. Science shows us instead that life is made up of coherent, integrated systems that only function when they act as a whole. This is why I say that life is characterised by irreducible complexity: a level of organisation that goes beyond simple matter, forcing us to recognise how great the mystery that surrounds us still is. Quando affermo che tutte le forme di vita presentano caratteristiche di complessità irriducibile, intendo sottolineare un punto fondamentale: la vita non può essere ridotta a una semplice somma di parti elementari. Prendiamo un organismo vivente: anche nelle forme più semplici, esistono strutture e processi che funzionano solo se tutte le componenti sono presenti e operative insieme. È un po’ come un’orchestra: se manca anche un solo strumento essenziale, l’armonia si spezza. Nella biologia questo è ancora più radicale: se un singolo ingranaggio del meccanismo vitale manca, la vita non può esistere. Questo concetto contrasta con l’idea che la vita possa essere spiegata unicamente come risultato di piccolissimi passi casuali. La Scienza ci mostra invece che la vita è fatta di sistemi coerenti, integrati, che non funzionano se non nella loro interezza. Per questo dico che la vita è caratterizzata da complessità irriducibile: un livello di organizzazione che va oltre la semplice materia, e che ci costringe a riconoscere quanto grande sia ancora il mistero che ci circonda. Antonino Zichichi, from a post in the official Facebook profile, 3 November 2025 See also Anthropic principle Complexity Fine-tuned universe Intelligent design External links Category:Creationism Category:Epistemology Category:Religion and science