大部分在古生代岩层中发现的化石都是没有脊骨的无脊椎动物，例如珊瑚、软体动物和三叶虫。
Most of the fossils seen in Paleozoic rocks are invertebrate animals lacking backbones, such as corals, mollusks and trilobites.
显生宙可划分为三个时期——依次经历古生代、中生代和新生代。
The Phanerozoic is divided into three eras -starting with the earliest, these are the Paleozoic, Mesozoic, and Cenozoic.
开展这项研究是为了进一步掌握高氧环境(类似地球在古生代晚期的环境)对动物体型巨大产生的影响。
The study was constructed to provide more insight into the effects a hyperoxic environment — like the kind our planet enjoyed in the late Paleozoic — might have had on animal gigantism.
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