Thomas Huxley: It is an error to imagine that evolution signifies a constant tendency to increased perfection. That process undoubtedly involves a constant remodelling of the organism in adaptation to new conditions but it depends on the nature of those conditions whether the directions of the modifications effected shall be upward or downward.

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English biologist and a leading exponent of Darwin's theory of evolution (1825-1895)

"It is an error to imagine that evolution signifies a constant tendency to increased perfection. That process undoubtedly involves a constant remodelling of the organism in adaptation to new conditions but it depends on the nature of those conditions whether the directions of the modifications effected shall be upward or downward."

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"Thomas Huxley." Quotes.net. STANDS4 LLC, 2010. 18 March. 2010. http://www.quotes.net/quote/1549