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Chimpanzees ? ?1. Chimpanzees(黑猩猩)will soon be extinct(灭绝). If the present rate of hunting and habit...

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Many people question the simple human activities of walking and carrying items.  Chimpanzee’s behaviors may suggest why humans walk on two legs.  Human walking upright is viewed as an adaptation to carrying precious resources.  Our ancestors’ ecological conditions resembled those of modern-day chimpanzees.  
Genetic Differences Between Chimps and Humans  Reasons for HIV Resistance  Implications of Chimpanzee Extinction for Humans  Effective AIDS Treatment  Genetic Similarities Between Chimps and Humans Chimps’ Resistance to HIV  
was   were   is   are  
regarded both types of nut as priced resources  preferred oil palm nuts to coula nuts  liked coula nuts better than oil palm nuts  ignored both types of nut altogether  
Chimpanzees are in the same process of evolution as our ancestors were.  Chimpanzees are similar to humans in many behaviors.  Walking on two limbs and walking on four limbs each have their advantages.  Human walking on two legs developed as a means of survival.  
Genetic Differences Between Chimps and Humans  Reasons for HIV Resistance  Implications of Chimpanzee Extinction for Humans  Effective AIDS Treatment  Genetic Similarities Between Chimps and Humans Chimps’ Resistance to HIV  
Because they imitated the human way of walking just for fun.  Because they wanted to please the researchers to get more coula nuts from them.  Because they wanted to get to die nut-rich forest faster by walking that way.  Because they wanted to carry more nuts with two free limbs.  
Genetic Differences Between Chimps and Humans  Reasons for HIV Resistance  Implications of Chimpanzee Extinction for Humans  Effective AIDS Treatment  Genetic Similarities Between Chimps and Humans Chimps’ Resistance to HIV  
Genetic Differences Between Chimps and Humans
Reasons for HIV Resistance
Implications of Chimpanzee Extinction for Humans
Effective AIDS Treatment  Genetic Similarities Between Chimps and Humans Chimps’ Resistance to HIV
  
when humans began walking on two legs  what made our ancestors walk upright  what benefits walking upright brought to our ancestors  how walking upright helped chimpanzees monopolize resources  

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