Only the individuals of a species are subject to the pressures of natural selection.
只有一个物种的个体感受到自然选择的压力。
Natural selection is what we normally think of as Darwin’s big idea.
我们通常认为自然选择（理论）是达尔文的伟大思想发现。
Natural selection can also, sometimes, be an agent of genetic uniformity.
有时，自然选择也是物种特性统一的推动者。
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。
Natural selection removed the thick hair but left behind the mechanism for controlling it.
自然选择褪去了厚厚的毛发，但是却把背后的控制机制留了下来。
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。
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。
If not natural selection, then what?
如果不是自然选择，那么又是什么呢？
That they developed naked necks is surely the result of natural selection.
即光脖子物种的出现必然是自然选择的结果。
More important, it sits better with biology's most fundamental principle, that of natural selection.
更重要的是，它符合了生物学自然选择的最基本规则。
That is how natural selection works.
这就是自然选择工作的方式。
Just how much a process like this can be shaped by natural selection is unclear.
仅自然选择到底能产生多少种类似进程，就仍未查明。
Genetic drift can even counteract natural selection.
基因漂变甚至可以抵消自然选择。
The question becomes how can natural selection create, or simply allow for, such inappropriate behavior?
自然选择怎么会创造(或者允许)这种不当行为的？
Here's how natural selection is supposed to work.
先来看看自然选择是如何运作的。
That's the current thinking, anyway: that only natural selection causes permanent genetic change..
当前，只有经过自然选择，基因才会发生质的变化。
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？
IT is not often that biologists have a chance to watch natural selection in action.
生物学家们不常有机会看到自然抉择是如何进行的。
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。
That's what natural selection is all about.
这个就是自然选择。
Natural selection has done a pretty tasty job already.
自然选择早已做好了品尝味道的工作。
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。
Natural selection, this is not to be.
天生没有选择，这是注定的。
Natural selection hits on a good design.
自然选择的图案都是最好的。
Adaptation is the result of natural selection.
适应是自然选择的结果。
We're already Human 2.0, not the Human 1.0, or Homo sapiens, that natural selection made us.
我们已经是人类的2.0版本，而不是人类的1.0版本，或称作智人，即自然选择结果的人。
Natural selection hits on a good design.
当自然选择挑中了一个理想的设计后。
The discipline seeks to explain behavior as a product of natural selection.
该学科试图将行为作为自然选择的一个产物来解释。
The discipline seeks to explain behavior as a product of natural selection.
该学科试图将行为作为自然选择的一个产物来解释。
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