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There’s a cool new Web site—and iPhone app—that could ____1____ in a wide variety of circumstances. It’s called Time Tree. And it tells you how closely related any two organisms are over time. In other words, it’ll tell you what the available data say is the time since any two organisms shared a common ancestor. Time Tree is ____2____ run by Penn State’s Blair Hedges and Arizona State’s Sudhir Kumar.
So let’s say you’re out for a walk in the woods, with your iPhone handy, and you ____3____ a grizzly bear. You quickly load the app and ____4____ the two organisms you’re interested in. Those would be you, a human, and grizzly bear, the thing that’s approaching you alarmingly fast. In just a couple of seconds, you are informed that you and the grizzly bear shared a common ancestor just 98.2 million years ago.
If you have a computer and are just curious about the grizzly bear, go to . The results average the findings of published papers ____5____ your search and include links to the papers.
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有个很酷的新网站和iPhone应用程序，名为“时间树”（Time Tree），它随时随地都能派上用场。它会告诉你，随着时间的推移，任意两个有机体之间的关系会有多密切。换句话说，它会通过现有数据告诉你任意两个有机体是在何时拥有共同祖先的。时间树由宾夕法尼亚州立大学的布莱尔•赫奇斯和亚利桑那州立大学的古普塔•库马尔共同开发。 现在我们假设你外出到一个树林里散步，随身携带着iPhone，在林中你碰巧遇到了一只灰熊。你迅速打开这个程序，输入两个你所感兴趣的有机体。一个是你——人类，另一个是灰熊——那个正在以惊人速度接近你的庞然大物。短短几秒钟的时间，你就可以查询到你与灰熊在九千八百二十万年前拥有共同的祖先。 如果你有台电脑，并对灰熊感兴趣，那么上时间树网站试试吧，网址是。查询结果是与你搜索内容相关的已发表论文中研究结果的平均值，而且查询结果中会列出这些论文的链接地址。