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| Note n°4921 |
par ygu3rrt6
le 01/04/2013 @ 18:19
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| Note n°4920 |
par tfy4v6a76
le 01/04/2013 @ 18:19
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| Note n°4919 |
par ygu3rrt6
le 01/04/2013 @ 18:19
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| Note n°4918 |
par Metcalfe
le 01/04/2013 @ 18:19
http://www.thenewerahats.com | | KANSAS CITY, Mo. - Our celebrated ancestor Lucywas no waddling,www.thenewerahats.com, hunched-over ape-woman who felt more at home inthe trees.New research from the University of Missouri in Columbia offersthe most conclusive evidence yet that Lucy and her tribe spenttheir lives on solid ground and walked much as modern humans do -more than 3 million years ago.Lucy, just 3? feet tall, would have been more capable ofstrutting her stuff on a dance floor than of swinging from branchto branch."I bet she could dance," said MU anatomy professor Carol Ward."I don't know if I could do any better."In research to be published Friday in the journal Science,Abercrombie Fitch Bags, Wardand two colleagues used a newly discovered foot bone from a dig inEthiopia to determine that members of Lucy's species,Australopithecus afarensis,www.swarovskijewelryus.com, had arched feet like ours.That may seem like a small detail, but it has huge implicationsfor the course of human evolution.And it may help settle a decades-old argument among scientistsover whether Lucy was a dedicated land rover or still spent much ofher time in trees, as many apes do.Arches put a spring in her step and made it possible tocomfortably stand and walk. But arches also took away theflexibility that lets apes grasp with their feet as they scrambleup trees."Is she a shuffling ape that just stood up?" Ward said. "Thistells us she's given up the ability to be good in trees to be goodon the ground. There was no more compromise."We can walk well over distances, and that started withAustralopithecus. It turned out to be a good plan for us."The possibility that our early ancestors stood upright andwalked with humanlike agility might surprise a lot of people, saidJeremy DeSilva, an anthropologist at Boston University.Classic charts of human evolution often show a series ofpictures of hulking chimplike creatures that gradually become moreupright."The anatomical evidence just doesn't support that view,"DeSilva said. "These (Australopithecus afarensis) were good uprightwalkers."That suggests upright walking was favored early in humanevolution, long before brains grew larger, DeSilva said. Lucy'sbrain wasn't much bigger than that of a chimpanzee.But why did our ancestors leave the safety of the trees for lifeon the ground?One possibility may have been climate change, said BruceLatimer, a paleoanthropologist at Case Western Reserve University.Millions of years ago, huge forests that provided habitat fordozens of species of apes in Europe,www.braceletsaleus.com, Asia and Africa began toshrink.But life on the ground held dangers for a two-legged animal."We're incredibly slow on two limbs," Latimer said. "If weinjure one leg, that makes us leopard food. It's such a peculiarway to get around."The big advantage of standing upright may have been that itfreed the hands of Australopithecus to carry things, Latimersaid.?A social system may have developed where males gathered food fortheir mates and offspring. That gave females the opportunity toraise more children."In evolution,Swarovski crystal chain, the most important thing is having babies,"Latimer said.A decade ago, Latimer visited a site on the edge of theSerengeti plain in Africa where fossilized footprints of three ofLucy's species were discovered.They show a small "Lucy" leading two larger ones single fileover ash from a volcano that had recently erupted. The leaderstopped and looked around. The two others stopped as well. Then thethree began walking again."They could be mistaken for human footprints, except that theywere 3.5 million years old," Latimer said.Based on his own research, Latimer has long advocated that Lucyhad an arched foot, but he never had enough evidence to proveit.?The fossilized bone, the fourth metatarsal, that Ward analyzedwas the key to determining the structure of Lucy's foot, accordingto Latimer.The fossil was found recently by William Kimbel of Arizona StateUniversity. The th |
| Note n°4917 |
par tfy4v6a76
le 01/04/2013 @ 18:18
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