Macroevolution studies how taxonomic groups above the level ofspecies change.

宏观进化在物种的层面之上，研究分类种群的变化。

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The ecological risk of DDT to different taxonomic groups was in the descending order of insects, crustaceans, and fishes.

DDT对无脊椎动物的风险最大，其次是甲壳类，对鱼类的风险最小。

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"We discovered that, using Numbers from the higher taxonomic groups, we can predict the number of species," said Dalhousie researcher Sina Adl.

“我们发现，用较高层次的分类类群的数量，就可以推算出物种的数量。”戴尔·蒙斯大学的研究员Sina Adl说。

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Of the main taxonomic groups (phyla), almost all are found in the oceans and half are exclusively marine.

UNESCO: MEDIA SERVICES