然而直到最近人们对后生动物的这些机制几乎仍一无所知。
But until recently, we knew nothing about these mechanisms 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.
同时，宏体藻类作为生态系统中的初级生产者成为一种新的食物，改变了后生动物的食谱。
In addition, the macroalgae served as a primary producer in the paleoecosystem to provide an alternative food for the metazoarl.
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