“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." Quotes.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.quotes.net/quote/1549>.