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evolution
The first 3 billion years of evolution saw the origin of life itself, the diversification of bacterial lineages, the origin and diversification of eukaryotes, and the appearance of many lineages of multicelled life, including animals. This time span culminated in the Cambrian explosion of complex metazoan organisms, but the fuse to the explosion was lit well before the start of the Cambrian (about 540 million years ago). Coupled with these events were major geologic events, such as the origin of the Earth's atmosphere and the appearance of tectonic plates, that profoundly influenced the history of life.
- 词性: noun
- 行业/领域: 科学
- 类别 普通科学
- Company: McGraw-Hill
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- Francisb
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