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The evolution of the eye
David Attenborough examines the arguments against the theory of evolution with respect to the development of the eye. He introduces William Paley's 'watchmaker analogy' and the argument that some structures in the natural world are so intricate that they must have required a designer. Darwin, however, argued that complex biological structures could be evolved gradually, if the process was given a long period of time and each stage of development provided incremental improvement on the last. Evidence for Darwin's theory can now be found throughout the animal kingdom, and organisms exhibit a range of primitive and derived eyes, from photoreceptor spots to the complex eyes of mammals and birds. First broadcast in the series 'Charles Darwin and the Tree of Life' in 2009.
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