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Published online 28 October 2004 | Nature | doi:10.1038/news041025-18
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Marine worm sports two kinds of 'eyes'
Vertebrate and insect vision may have evolved from the same precursor.
Darwin famously realized that the eye would be a key test for his theory of evolution by natural selection. He suggested gradual steps from an "imperfect and simple" form, and modern scientists have no trouble believing that the eye evolved from a single light-detecting cell.
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