Many protective mechanisms of unicellular organisms were preserved in all cells of multi-cellular organisms, whereas others were preserved only in specialized cells.
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。
Basically, it took a billion years to have life on Earth. And very rapidly, they became multi-cellular, they could replicate, they could use photosynthesis as a way of getting their energy source.
基本上，经过十亿年地球上才开始有生命存在，而非常迅速地，它们变成了多细胞有机体。
Basically, it took a billion years to have life on Earth. And very rapidly, they became multi-cellular, they could replicate, they could use photosynthesis as a way of getting their energy source.
基本上，经过十亿年地球上才开始有生命存在，而非常迅速地，它们变成了多细胞有机体。
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