“Evolution is a theory of organic change, but it does not imply, as many people assume, that ceaseless flux is the irreducible state of nature and that structure is but a temporary incarnation of the moment. Change is more often a rapid transition between stable states than a continuous transformation at slow and steady rates. We live in a world of structure and legitimate distinction. Species are the units of nature's morphology.”

"A Quahog is a Quahog", p. 213
The Panda's Thumb (1980)

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Stephen Jay Gould 274
American evolutionary biologist 1941–2002

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