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În prealabil postat de vladstejaru
Salut,
Sunt tentat sa cred in teoria evolutionista, mai ales prin prisma studiilor facute in ultimii 20 de ani.
Am citit un articol la http://uk.news.yahoo.com/team-sheds-...000212560.html este foarte interesant, despre cum au inceput maimutele sa mearga in doua picioare; e o teorie simpla, legata de obtinerea hranei de zi cu zi cu mai multa usurinta.
Voi ce parere aveti? Sunt valabile aceste teorii?
Doamne ajuta!
Vlad |
Articolul nu mai e disponibil la
http://uk.news.yahoo.com/team-sheds-...000212560.html asa ca il voi posta aici:
"New research published in the latest edition of Current Biology, and carried out by a team of international researchers, says that humans began to walk upright millions of years ago because of the necessity of carrying scare resources.
Researchers from the United States, United Kingdom, Japan and Portugal carried out the study by examining the way modern-day chimpanzees act as they compete with each other for food resources.
Dr. Brian Richmond, one of the study’s authors and associate professor of anthropology at George Washington University’s Columbian College of Arts and Sciences, said:
“These chimpanzees provide a model of the ecological conditions under which our earliest ancestors might have begun walking on two legs.”
“Something as simple as carrying—an activity we engage in every day—may have, under the right conditions, led to upright walking and set our ancestors on a path apart from other apes that ultimately led to the origin of our kind.”
The findings of the study indicate that chimpanzees change to walking on two legs instead of four when they need to grab food resources quickly as they may only be available in a limited supply. Being on two legs frees up the chimpanzees’ hands which allows them to carry more.
The research team based in Guinea carried out two studies. In the first study, wild chimpanzees were given oil palm nut and coula nuts. The coula nuts are not readily available in the wild so are a scarce resource. Using different testing techniques it was shown that when the rare coula nuts were made available in limited amounts, the chimpanzees carried more at a time. When coula nuts made up the majority of the resources, the oil palm nuts were ignored completely in favour of the coula nuts.
Researchers say that the chimpanzees considered the coula nut a more valuable resource and began to compete more heavily for them, and the amount of time the chimpanzees spent moving on two feet increased dramatically.
Another study carried out by Kimberley Hockings of Oxford Brookes University also showed that when chimpanzees feel it necessary to ‘crop raid’ for scarce and valuable resources, the amount of time they spend on two legs increased in attempt to free up their hands so they can carry more food."