“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 H. Huxley Quotes." Quotes.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.quotes.net/quote/37969>.