Thus, natural selection stabilized this host-parasite relationship.
因此，自然选择让这种寄主-寄生关系变得稳定。
The answer we'll propose of course is that their behavior is largely a matter of natural selection.
我们给出的答案当然是它们的行为大部分是自然选择的结果。
At times, it is actually possible to watch the effects of natural selection in host-parasite relationships.
有时，在宿主-寄生虫关系中观察自然选择的影响实际上是可能的。
Charles Darwin, the first to describe the role of natural selection in speciation, wrote about the mechanisms of speciation.
查尔斯·达尔文是第一个描述自然选择在物种形成中的作用的人，他描写了物种形成的机制。
According to the first of these theories, each individual has evolved, aided by natural selection, an adaptation to the rhythmic environment.
根据第一个理论，在自然选择的帮助下，每个个体经过进化都适应了这个有规律的环境。
Once natural selection had shaped the adaptations that helped plants overcome the obstacles to terrestrial living, plants prospered and diversified.
一旦自然选择塑造了植物的适应机制，使之克服在陆地生活的障碍，植物物种就生机勃勃且丰富多样了。
As Charles Darwin observed, natural selection operates whenever individuals of one genetic composition are better at reproducing than that of others.
正如查尔斯·达尔文（Charles Darwin）所观察到的那样，只要有一种基因组成的个体比其他个体更善于繁殖，自然选择就会起作用。
Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them.
同时，由于自然选择更倾向于选择那些能够感染宿主但不致其死亡的病毒，这种致命病毒便随着宿主的死亡而消失。
The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus and Tyrannosaurus rex.
结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙和雷克斯霸王龙族群。
If not natural selection, then what?
如果不是自然选择，那么又是什么呢？
That is how natural selection works.
这就是自然选择工作的方式。
That's what natural selection is all about.
这个就是自然选择。
Here's how natural selection is supposed to work.
先来看看自然选择是如何运作的。
Genetic drift can even counteract natural selection.
基因漂变甚至可以抵消自然选择。
So it really does matter whether natural selection is true.
因此自然选择究竟是否正确，真的非常重要。
Might evolution by natural selection explain complex thought?
通过自然选择的进化可以解释复杂的思维吗？
Markets and natural selection could help ease the problem, too.
市场及自然选择也可以帮助缓解这个问题。
The idea of evolution by natural selection is not hard to grasp.
自然选择导致进化的观点并不难理解，只需要把几个得到普遍认同的观点联系起来就能够得到。
In fact, natural selection often leads to ever greater simplicity.
事实上，自然选择往往导致越来越简单。
They emerged from myriad possible shapes through natural selection.
这些是从无数可能的图形中通过自然选择出现的。
And the challenge was the theory of evolution by natural selection.
其中极富挑战性的观点则是生物进化是通过自然选择实现的。
ANTIBIOTIC drugs are a well-known test of the idea of natural selection.
抗生素是对自然选择学说一个十分知名的论证。
Darwin's theory of natural selection is intended to answer this question.
达尔文的自然选择理论正是为了回答这个问题。
The first rule of natural selection is: “If it ain't broke, don't fix it.
自然选择的第一条规则是：“如果没坏，就不要修理它。”
The first rule of natural selection is: “If it ain’t broke, don’t fix it.”
自然选择的第一条规则是：“如果没坏，就不要修理它。”
In the case of the animal kingdom, we often call this type of thing "natural selection."
在动物王国里，我们通常把这类事情称为自然选择。
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