但是没有34亿年前出现的单细胞生物的历史久。
But they don't beat single-celled organisms that emerged about 3.4 billion years ago.
近几年来五种单细胞生物的基因组计划得以完成。
Five genome projects on single cell microbes have been finished in recent years.
许多单细胞生物的防卫机制，在多细胞生物的所有细胞中保留下来，而其他机制仅存在于特化的细胞。
Many protective mechanisms of unicellular organisms were preserved in all cells of multi-cellular organisms, whereas others were preserved only in specialized cells.
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