When a species goes extinct, it dramatically changes the landscape of biodiversity.(当一个物种灭绝时，它会极大地改变生物多样性的状况。)
Meteorite impacts can be advantageous for some species, which thrive, and disastrous for other species, which become extinct.(陨石的撞击对某些物种是有利的，它们会茁壮成长；而对其他物种则是灾难性的，它们会灭绝。)
If these great cats become extinct, the smaller animals they prey upon will overpopulate the forests.(如果这些大型猫科动物灭绝了，那么它们捕食的小型动物将会使森林中物种的密度过高。)
The idea of cloning extinct life forms still belongs to science fiction.(对绝种的生命形式进行克隆的想法仍然属于科学幻想。)
This was a landscape where antelope of all kinds abounded—along with Bos primigenius, a kind of oxen that has become extinct.(这是一片充满了各种羚羊的土地——还有原牛，一种已经灭绝的牛。)
With all that attention paid to them, you'd think these creatures would at least have the gratitude not to go extinct.(人们对这些生物如此关注，你可能会想，它们没有灭绝至少应该心存感激。)
Indeed, most analysts believe that some kind of environmental degradation underlies the demise of many extinct salmon populations.(事实上，大多数分析家认为某种环境退化是许多已灭绝鲑鱼种群消亡的根源。)
Let's take the now extinct American cheetah, for instance.(让我们以现在已经灭绝的美洲猎豹为例。)
It is better for the sake of evolution to allow creatures to go extinct.(为了进化，最好让生物灭绝。)
Geigl and her colleagues looked at 3200-year-old fossil bones belonging to a single individual of an extinct cattle species called an aurochs.(盖格尔和她的同事们研究了3200年前的骨头化石，这些骨头属于一种已经灭绝的叫做欧洲野牛的种类。)
