What genetic change allowed multicellular animals to come into existence remains obscure.

什么样的遗传突变产生了多细胞的动物还不清楚.

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They inhabit virtually all environments, including soil, water, organic matter, and the Bodies of multicellular animals.

几乎可在所有的环境下生存, 包括土壤 、 水 、 有机物质, 以及多细胞动物体内.

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