句子分析

knightyn 2016-10-12 08:41:47 阅读: 1443

句子

The geologic timescale is marked by significant geologic and biological events, including the origin of Earth about 4,6 billion years ago, the origin of life about 3,5 billion years ago, the origin of eukaryotic life-forms (living things that have cells with true nuclei) about 1,5 billion years ago, and the origin of animals about 0,6 billion years ago.

 
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