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Home > Category Index for Science Quotations > Category Index P > Category: Punctuated Equilibria

Punctuated Equilibria Quotes (3 quotes)

If new species arise very rapidly in small, peripherally isolated local populations, then the great expectation of insensibly graded fossil sequences is a chimera. A new species does not evolve in the area of its ancestors; it does not arise from the slow transformation of all its forbears.
co-author with Niles Eldridge (palaeontologist, 1943- )
'Punctuated Equilibria: An Alternative to Phyletic Gradualism', in Thomas J. M. Schopf (ed.), Models in Paleobiology (1972), 84.
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Since we proposed punctuated equilibria to explain trends, it is infuriating to be quoted again and again by creationists–whether through design or stupidity, I do not know–as admitting that the fossil record includes no transitional forms. Transitional forms are generally lacking at the species level, but they are abundant between larger groups.
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The history of life is more adequately represented by a picture of 'punctuated equilibria' than by the notion of phyletic gradualism. The history of evolution is not one of stately unfolding, but a story of homeostatic equilibria, disturbed only 'rarely' (i.e. rather often in the fullness of time) by rapid and episodic events of speciation.
'Punctuated Equilibria: An Alternative to Phyletic Gradualism', in Thomas J. M. Schopf (ed.), Models in Paleobiology (1972), 84.
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Carl Sagan Thumbnail In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion. (1987) -- Carl Sagan
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Sophie Germain
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William Harvey
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- 90 -
Antoine Lavoisier
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Winston Churchill
- 80 -
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- 70 -
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- 60 -
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- 50 -
Stephen Hawking
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- 40 -
Pierre Fermat
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Archimedes
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- 30 -
Andreas Vesalius
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- 20 -
Carl Sagan
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- 10 -
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