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Dans ce texte on présente brièvement les thèses gradualistes et ponctualistes souvent mal comprises.On insiste sur le fait que le ponctualisme correspond au couple stase-ponctuation. On montre que les travaux des stratigraphes des 25 dernières années ont mis en évidence des anagenèses bien caractéristiques. En outre, les travaux réalisés chez les Grilladae, Bufo, Drosophila ont montré de très nombreuses...
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