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。
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。
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。
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。
But other phenomena that look like diseases are known to be maintained by natural selection.
但是据了解，其他一些看似疾病的现象则被视作源于自然选择。
But natural selection takes time - sometimes millions or even hundreds of millions of years.
不过自然选择需要时间-有时候是数百万年甚至是数百亿年。
The question is whether natural selection really shaped that preference, as the study claims.
问题在于是否真的像这项研究所说的，是自然选择造成这一偏好。
He thought that natural selection had operated on us, just as it had on fruit flies and centipedes.
他认为自然选择对我们产生了作用，正如对待果蝇和蜈蚣那样。
Through natural selection over thousands of years, these characteristics continue to the present day.
经过数千年的物竞天择，这些特征延续至今。
But many rejected natural selection, preferring other kinds of mechanisms to drive evolutionary change.
但是，许多人拒绝自然选择理论，他们更喜欢驱使生物演化式变化的其他各种机制。
The rationale for this is that natural selection has adapted Paleolithic humans to the food in that era.
对于这种饮食产生的原因是，旧石器时代人类通过自然选择已经适应了那个时代的食物。
Complex structures and behaviour such as eyes and language are undoubtedly the product of natural selection.
复杂的结构和行为，例如眼睛和语言毋庸置疑是自然选择的产物。
The book was “On the Origin of Species”. And the challenge was the theory of evolution by natural selection.
这个人就是查理斯•罗伯特•达尔文，这本书叫做《物种起源》，而发起的挑战则是基于自然选择说的进化论。
But natural selection swings a sharp edge, and the teen's sloppier moments can bring unbearable consequences.
但是，自然选择是把双刃剑，青少年的草率会带来令人无法承受的后果。
Viruses have genes, can reproduce and are subject to the evolutionary pressures imposed by natural selection.
病毒拥有基因，能够繁殖并且受制自然选择的进化压力。
In Darwin's theory, natural selection favors traits and behaviors that promote individual reproductive success.
达尔文的理论认为，自然选择倾向于能够促进个体繁殖成效的特性和行为。
Stearns found that natural selection favors heavier women and reduces the age at which a woman has her first child.
Stearns发现自然选择倾向于更重的女性，还会减少女性拥有第一个孩子的年龄。
Left us with a theory of adaptation through natural selection that remains at the core of modern evolutionary biology.
达尔文给我们留下了通过自然选择适应的理论，这仍然是现代进化生物学的核心。
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