It contains no ancestors of modern animal groups.
它不包含现代动物群体的祖先。
The Burgess Shale formation also has fossils of many extinct representatives of modern animal groups.
伯吉斯页岩地层中也有许多代表着现代动物群中已经灭绝的物种的化石。
Despite striking similarities, the animal groups do differ in some ways.
尽管有显著的相似性，这些动物群体也在某些方面有不同之处。
Members of two animal groups, arthropods and vertebrates, are capable of sound reception.
有两个动物门的成员可以接收声音，节肢动物与脊椎动物。
Members of two animal groups, arthropods and vertebrates, are capable of sound reception.
有两个动物门的成员可以接收声音，节肢动物与脊椎动物。
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