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最新推荐文章于 2020-12-15 12:45:37 发布

ujn20161222

最新推荐文章于 2020-12-15 12:45:37 发布

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本文链接：https://blog.youkuaiyun.com/ujn20161222/article/details/87876663

本文探讨了早期软体动物化石稀少的原因，指出软体动物的化石化需要特殊条件，并讨论了寒武纪大爆发的独特性及其快速进化与物种灭绝的特点。文章还提出，寒武纪大爆发之所以不同寻常，可能是因为当时存在大量未被占据的生态位。

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One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft bodied and simply did not fossilize. Fossilization of soft-bodied animals is less likely than fossilization of hard-bodied animals, but it does occur. It is relatively rare because the fossilization of soft-bodied animals requires a special environment. Conditions that promote fossilization of soft-bodied animals include very rapid covering by sediments that create an environment that discourages decomposition. In fact, fossil beds containing soft-bodied animals have been known for many years.

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What can be inferred from paragraph 7 about why the Cambrian explosion is so unusual?

为啥unusual

而不是为啥发生

Fossil formations like the Burgess Shale show that evolution cannot always be thought of as a slow progression. The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals.

Why was this evolution so rapid? No one really knows. Many zoologists believe that it was because so many ecological niches were available with virtually no competition from existing species.