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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. [1]
In the following chapters, Behe discusses the apparent irreducible complexity of several biological systems, including the cilium, the bacterial flagellum, blood clotting, the immune system, and vesicular transport. Behe claims the underlying complexity and biochemical mechanisms of the systems are vastly under-appreciated, and identifies other ...
The rate of eye evolution is difficult to estimate because the fossil record, particularly of the lower Cambrian, is poor. How fast a circular patch of photoreceptor cells can evolve into a fully functional vertebrate eye has been estimated based on rates of mutation, relative advantage to the organism, and natural selection.
Irreducible complexity is a negative argument against evolution, not proof of design, a point conceded by defense expert Professor Minnich." [51] "Professor Behe's concept of irreducible complexity depends on ignoring ways in which evolution is known to occur.
Irreducible complexity: Darwin stated that if a structure existed that could not possibly have been created by small steps through natural selection then his theory would break down. Intelligent design advocates have proposed many candidates for "Darwin's exception," such as the human eye.
To dispel the idea that complexity cannot arise without the intervention of a "creator", Dawkins uses the example of the eye. Beginning with a simple organism, capable only of distinguishing between light and dark, in only the crudest fashion, he takes the reader through a series of minor modifications, which build in sophistication until we ...
Although the eye remains a common and popular argument among laypeople, some intelligent design and creationism advocates have abandoned the eye as an example of "irreducible complexity" because of the relatively thorough understanding of its evolutionary origins biologists now have, instead relying more on mollecular and microscopic structures ...
Eye types can be categorised into "simple eyes", with one concave photoreceptive surface, and "compound eyes", which comprise a number of individual lenses laid out on a convex surface. [1] "Simple" does not imply a reduced level of complexity or acuity. Indeed, any eye type can be adapted for almost any behaviour or environment.