以下为句子列表：
英文: The impact opened ecological niches for mammalian evolution, which eventually led to the development of our own species.
中文: 这场浩劫为哺乳类的演化提供了生态区位，使我们这个物种最终得以诞生。
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英文: The latter says it is that they are all adapted to live in the same ecological niche.
中文: 后者则认为是由于它们都适应生活在同一个生态环境。
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英文: These bacteria are symbiotic with their human hosts—drawing sustenance from them, but also giving something in return by performing chemical transformations that human cells cannot manage and safely occupying ecological niches that might otherwise be colo
中文: 这些细菌与它们的人类宿主处于一种共生的关系——尽管像那个宿主那里获取营养物质，但反过来能帮助人体实现身体细胞不能做到的化学反应或是防止病原菌侵入人体而保持生态上的平衡。
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