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Biology 14 Online
OpenStudy (anonymous):

how was darwin able to rationalize the evolution of something as complex of the of the eye

OpenStudy (anonymous):

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 certain 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 by natural selection

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