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托福阅读题目：考古学
我们知道有很多动物化石存在，但是昆虫虽然占据了生物界三分之一的数量，但其化石存留还是很少的。留存昆虫化石的方式有两种，琥珀和一种岩石。琥珀留存的昆虫化石相对来说很完整，而另一种方式基本只能存下来翅膀。昆虫分为有翅膀的和没有翅膀的，下一级还可以再细分。我们很难追溯到最古老的昆虫，因为目前发现的时间最久的昆虫化石也展现出一些进化后的特征。
We know that there are a lot of animal fossils, but although insects account for a third of the biomass, there are still very few fossils. There are two ways to keep fossil remains, amber and a rock. The fossilized remains of the amber are relatively complete, and the other is basically the only way to save the wings. Insects are divided into winged and wingless, and the next level can be subdivided. It's hard to trace back to the oldest insects, because the oldest known insect fossils also exhibit some evolutionary traits.
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