منابع مشابه
The Cambrian explosion
The sudden appearance of fossils that marks the so-called 'Cambrian explosion' has intrigued and exercised biologists since Darwin's time. In On the Origin of Species, Darwin made it clear that he believed that ancestral forms 'lived long before' their first fossil representatives. While he considered such an invisible record necessary to explain the level of complexity already seen in the foss...
متن کاملThe Cambrian Explosion
The Precambrian genesis plus Cambrian explosion scenario also implies a perplexing view of a major evolutionary radiation: a long period of cryptic speciation with increasing developmental complexity and anatomical sophistication, yet without substantial behavioural or ecological modification or diversification, followed by a sudden increase in morphological and ecological innovation. Page 1046...
متن کاملThe Cambrian "explosion": slow-fuse or megatonnage?
Clearly, the fossil record from the Cambrian period is an invaluable tool for deciphering animal evolution. Less clear, however, is how to integrate the paleontological information with molecular phylogeny and developmental biology data. Equally challenging is answering why the Cambrian period provided such a rich interval for the redeployment of genes that led to more complex body plans.
متن کاملDid Consciousness Cause the Cambrian Evolutionary Explosion?
When and where did consciousness emerge in the course of evolution? Did it happen as recently as the past million years, for example concomitant with language or tool making in humans or primates? Or did consciousness arrive somewhat earlier, with the advent of mammalian neocortex 200 million years ago (Eccles, 1992)? At the other extreme, is primitive consciousness a property of even simple un...
متن کاملMolecular clocks: Defusing the Cambrian ‘explosion’?
You do not have to believe in punctuated equilibria — and given its status as ideological straw-man par excellence, why should you? — to accept that the history of life shows periods of rapid change separated by evolutionary longueurs of immense duration. In recent years, the socalled Cambrian ‘explosion’ has enjoyed the lion’s share of attention from those interested in periods of apparently r...
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ژورنال
عنوان ژورنال: The Journal of The Institute of Image Information and Television Engineers
سال: 2007
ISSN: 1881-6908,1342-6907
DOI: 10.3169/itej.61.k12