Why does the fossil record not document the series of evolutionary changes during the evolution of animals?
为什么化石记录没有记录动物进化过程中的一系列进化变化？
They reasoned that while some evolutionary changes involve the loss of genes and are therefore irreversible, others may be the result of genes being switched off.
他们推断，虽然一些进化上的变化涉及基因的丢失，因此是不可逆转的，但其他的变化可能是基因被关闭的结果。
But not all evolutionary changes make inherent sense.
但不是所有的进化都有内在的意义。
This phenomenon is sometimes used to explain rapid evolutionary changes.
这种现象有时被用来解释快速演化。
The researchers at Stanford, Georgia and Pennsylvania State universities in the US wanted to trace evolutionary changes in human DNA.
项目研究人员分别来自美国斯坦福、乔治亚和宾夕法尼亚州立大学，他们试图找出人类进化过程中基因的演变。
Fossils can also be compared with their extant relatives to assess evolutionary changes.
化石也能与它们现存的亲属作比较，以评价其演化变化。
Indeed, the rise of farming has been linked to evolutionary changes in genes for other enzymes, such as amylase, which breaks down starch, and lactase, which breaks down lactose in milk.
确实，农业的兴起与基因上很多酶的进化变化紧密联系，如那分解淀粉的淀粉酶amylase，和乳糖分解酶，分解牛奶中的乳糖等。
The alternative view, that evolutionary changes tick along gradually, suggests mutations would accumulate incrementally as time goes by, independently of how many new species a lineage spins off.
与此相对应，认为进化上的改变是渐进式的观点认为突变是随着时间的流逝而不断积累的，这一过程同一支世系衍生出新物种的多少无关。
Scientists believe earthworms have undergone rapid evolutionary changes at abandoned mines in Britain, which have enabled them to survive and even thrive in an environment rich in toxic heavy metals.
科学家们相信，英国废弃矿井中的这些蚯蚓经历了快速的进化，废弃矿井使它们能够在富含重金属的环境中生存，甚至茁壮成长。
Evolutionary changes show a clear heritage to prior service specifications.
渐进的更改表现出对以前服务规范的明显继承。
Evolutionary changes show a clear heritage to prior service specifications.
渐进的更改表现出对以前服务规范的明显继承。
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