منابع مشابه
"Cladistic Analysis or Cladistic Classification?": A Reply to Ernst Mayr
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sister groups by any stretch of the imagination. In a very elegant paper, Moroz [2009] reviews the literature, subjects the data to a correct cladistic analysis, and concludes that centralized nervous systems have evolved independently, perhaps as many as seven times. In a particularly striking example, he demonstrates that complex brains have evolved at least three times in molluscans alone. H...
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A cladislic viewpoint provides an historical definition of adaptation and an operational ecological test for evolutionary adaptations. Adaptation is apomorphic function promoted by natural selection, as compared with plesiomorphic function. Adaptation is thus a conditional, hierarchical, comparative term, like homology. Hypotheses of adaptation that do not specify levels of apomorphy are weak; ...
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For about a century and a half now one of the usual tasks of historical linguistics has been reconstructing the prehistory of linguistic communities. (That is, of course, the side of reconstruction that non-linguists are interested in.) A perennial question is what sort of model of linguistic diversification best fits the data. This paper will explore that question in the light of data supporti...
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This paper has intended to discover and show some educational and nearly ethical problems in Jahiz` plentiful works. The paper, as a fundamental study, has surveyed the problem in an analytico-descriptive method and used his works directly. As is understood by the paper, Jahiz` educational and ethical views, deserving special attention, have been recorded in different places of his plentiful wo...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/291007d0