线虫作为土壤中数量最丰富的后生动物，其生活史和取食类型多样，在生态系统中发挥着重要作用。
Soil nema todes are the most abundant metazoan which have various types of life-history and feeding habits and play a key role in soil food web.
越来越多的证据表明，后生动物大脑在感应饮食限制和促进寿命延长中起关键作用。
More evidences indicate that the brain has a principle role in sensing dietary restriction and extending lifespan in metazoans.
对比论述了后生动物的演化和环境因素在叠层石的形成与衰减的过程中谁占主导作用。
At last, this paper discusses what is the dominant function in the formation and decline of stromatolites beween the evolution of metazoans and changing environments.
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