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。

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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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We talked about last time that part of the process of going from this single cell to multi cellular many celled organisms like we are is cell division.

我们上节课说过,从一个单细胞分裂形成大量细胞,构成的器官的过程,叫做细胞分裂

耶鲁公开课 - 生物医学工程探索课程节选

We talk about cells as being kind of the fundamental unit of humans and other multi-cellular organisms.

我们某种意义上把细胞视为,人体和其它多细胞生物的基本单位

耶鲁公开课 - 生物医学工程探索课程节选

During development of the embryo it goes from being a single cell, the fertilized egg, to being a multi-cellular organism with billions of cells in it.

胚胎的发育,始于一个单一细胞,即受精卵,直到形成一个以十亿计数量的细胞构成的,多细胞有机体

耶鲁公开课 - 生物医学工程探索课程节选

The most obvious difference between a yeast and a nematode is that one is single-celled while the other is multi-cellular.

ECONOMIST: The first complete DNA sequence of an animal is now in the bag

Multi-cellular creatures have to do several things that single-celled ones do not.

ECONOMIST: The first complete DNA sequence of an animal is now in the bag

"We are hoping to locate multi-cellular organisms living in hot springs at temperatures well above the 150 degrees Fahrenheit that scientists now believe to be the upper limit at which that kind of life can exist, " Trent said.

CNN: NASA probes for tiny life at Yellowstone