Darwin's Theory Of Evolution

The construct of irreducible complexity is a pivotal aspect of genetic theory and of Darwinian theory. Irreducible complexity is a nexus of the older science of biology from which Darwin built his theory and modern genetic engineering. Darwin's words for irreducible complexity, most commonly associated with his argument about the construction of the eye, were "Organs of extreme perfection and complication," and Darwin further explicates,

"Reason tells me, that if numerous gradations from a simple and imperfect eye to one complex and perfect can be shown to exist, each grade being useful to its possessor, as is certainly the case; if further, the eye ever varies and the variations be inherited, as is likewise certainly the case and if such variations should be useful to any animal under changing conditions of life, then the difficulty of believing that a perfect and complex eye could be formed...
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