大象的消失促进了现代人的出现-凯发k8官网

大象的消失促进了现代人的出现
文章来源:未知 文章作者:enread 发布时间:2011-12-13 05:58 字体: [ ] 
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elephants have long been known to be part of the homo erectus(直立人) diet. but the significance of this specific food source, in relation to both the survival of homo erectus and the evolution of modern humans, has never been understood -- until now. when tel aviv university researchers dr. ran barkai, miki ben-dor, and prof. avi gopher of tau's department of 1 and ancient near eastern studies examined the published data describing animal bones associated with homo erectus at the acheulian site of gesher benot ya'aqov in israel, they found that elephant bones made up only two to three percent the total. but these low numbers are misleading, they say. while the six-ton animal may have only been represented by a tiny percentage of bones at the site, it actually provided as much as 60 percent of animal-sourced calories.

the elephant, a huge package of food that is easy to hunt, disappeared from the middle east 400,000 years ago -- an event that must have imposed considerable 2 stress on homo erectus. working with prof. israel hershkovitz of tau's sackler 3 of medicine, the researchers connected this evidence about diet with other cultural and anatomical(解剖的) clues and concluded that the new hominids(人种) recently discovered at qesem cave in israel -- who had to be more 4(敏捷的) and 5 to satisfy their dietary needs with smaller and faster 6 -- took over the middle eastern landscape and eventually replaced homo erectus.

the findings, which have been reported in the journal plos one, suggest that the 7 of elephants 400,000 years ago was the reason that modern humans first appeared in the middle east. in africa, elephants disappeared from archaeological sites and homo sapiens(智人) emerged much later -- only 200,000 years ago.



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1 0v2zi     
n.考古学
参考例句:
  • she teaches archaeology at the university.她在大学里教考古学。
  • he displayed interest in archaeology.他对考古学有兴趣。
2 4hrxn     
adj.营养的,滋养的
参考例句:
  • a diet lacking in nutritional value will not keep a person healthy.缺乏营养价值的饮食不能维持人的健康。
  • the labels on food products give a lot of information about their nutritional content.食品上的标签提供很多关于营养成分的信息。
3 hhkzk     
n.才能;学院,系;(学院或系的)全体教学人员
参考例句:
  • he has a great faculty for learning foreign languages.他有学习外语的天赋。
  • he has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。
4 ix2za     
adj.敏捷的,灵活的
参考例句:
  • she is such an agile dancer!她跳起舞来是那么灵巧!
  • an acrobat has to be agile.杂技演员必须身手敏捷。
5 m2yxg     
adj.知识渊博的;有见识的
参考例句:
  • he's quite knowledgeable about the theatre.他对戏剧很有心得。
  • he made some knowledgeable remarks at the meeting.他在会上的发言颇有见地。
6 g1czh     
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
参考例句:
  • stronger animals prey on weaker ones.弱肉强食。
  • the lion was hunting for its prey.狮子在寻找猎物。
7 ouex5     
n.消失,消散,失踪
参考例句:
  • he was hard put to it to explain her disappearance.他难以说明她为什么不见了。
  • her disappearance gave rise to the wildest rumours.她失踪一事引起了各种流言蜚语。
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