quinta-feira, 9 de outubro de 2014

15 respostas aos disparates criacionistas

15 respostas aos disparates que os criacionistas propagam: http://www.scientificamerican.com/article/15-answers-to-creationist/

Como exemplo:

«2. Natural selection is based on circular reasoning: the fittest are those who survive, and those who survive are deemed fittest.
"Survival of the fittest" is a conversational way to describe natural selection, but a more technical description speaks of differential rates of survival and reproduction. That is, rather than labeling species as more or less fit, one can describe how many offspring they are likely to leave under given circumstances. Drop a fast-breeding pair of small-beaked finches and a slower-breeding pair of large-beaked finches onto an island full of food seeds. Within a few generations the fast breeders may control more of the food resources. Yet if large beaks more easily crush seeds, the advantage may tip to the slow breeders. In a pioneering study of finches on the Galápagos Islands, Peter R. Grant of Princeton University observed these kinds of population shifts in the wild [see his article "Natural Selection and Darwin's Finches"; Scientific American, October 1991].
The key is that adaptive fitness can be defined without reference to survival: large beaks are better adapted for crushing seeds, irrespective of whether that trait has survival value under the circumstances.»

Sim, esta "objecção" já é velha. E é um disparate, como tudo o que sai da boca (ou em alguns casos, da ponta dos dedos) dos criacionistas.  

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