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地球最大规模物种灭绝之一，被"天河二号"层层揭开
source link: https://tech.sina.com.cn/d/c/2020-03-13/doc-iimxyqwa0072926.shtml
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来源：Nature自然科研古生物学家以令人惊叹的细节勾勒出3亿年的地球历史。古生物学家对地球历史的认识是非常模糊的。因为不完整的化石记录和不够精确的测年技术，要厘清数百万年地质时代里发生的各种事件绝非易事。但如今，地球史上一个动物复杂性爆发
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