与生命本身的起源相比，多细胞生命形态的起源似乎是相对简单的一步。
The origin of multicellular forms of life seems a relatively simple step compared to the origin of life itself.
在其之后，第一个多细胞动物出现。
那些单细胞在一天内已经进化成多细胞生物。
The cells rapidly evolved into multi-cell creatures in a day.
20亿年前的古老化石可能是地球上最早的多细胞生物。
2-billion-year-old Fossils May Be Earliest Known Multicellular life.
这构成多细胞生物。
这构成多细胞生物。
什么样的遗传突变产生了多细胞的动物还不清楚。
What genetic change allowed multicellular animals to come into existence remains obscure.
一般来说，多细胞生物的细胞中含有一套相同的基因。
As a general rule, the cells of a multicellular organism all contain the same set of genes.
成为多细胞生物意味着氧需要通过细胞而不只是通过机体的表面。
Being multicelluar means oxygen has to get to cells not on the surface of the organism.
他说多细胞生命可能在多处地点演化，只是其化石尚未被发现而已。
He said multicellular organisms likely evolved in many places, but the fossils haven't yet been found.
细胞存活与凋亡之间的平衡是多细胞生物正常发育与稳态的关键。
The balance between cell survival and apoptosis is crucial for normal development and homeostasis of multicellular organisms.
多细胞生物需要身体中大部分的细胞采取极大的达尔文牺牲，牺牲其本身的繁殖。
Multicellularity requires most of the cells in a body to make the supreme Darwinian sacrifice, by giving up reproducing.
目的探讨A549肺腺癌多细胞球体放射抗拒细胞的化疗药物敏感性。
Objective To investigate the chemosensitivity of irradiated resistant cells of multicellular spheroids in A549 lung adenocarcinoma.
地球深层多细胞生物的发现，对于在太阳系其它行星寻找地下生命也有重要的启示。
The discovery of multicellular life in the deep subsurface of the Earth also has important implications for the search for subsurface life on other planets in our solar system.
如果真的是这样，那么，现代领鞭虫就给了我们一个窥探多细胞生物如何形成的机会。
If that's true, modern choanoflagellates give us a glimpse of how multicellular animals began.
从某种角度看，我们是多细胞生物，但从另一角度看，我们还有一个单纯的‘自我’。
How at one level we are cellular beings and another we are a single "self."
在我们最早的多细胞生物祖先于数亿年前在地球上出现时，癌症可能就已经存在。
Cancer has probably existed ever since our first multicellular ancestors appeared on Earth hundreds of millions of years ago.
胚性细胞分裂产生两个细胞，进而分化发育成多细胞原胚、球形胚、心形胚及子叶胚。
Then embryogenic cell divided into two cells, which sequentially differentiated through multicell proembryo, globular, heart-shaped and cotyledonary embryo stages.
在此，我们研究围绕着在多细胞生物的进化信号网路中是否存在着相近的理论而展开。
Here, we investigate whether similar principles influence the evolution of signaling networks in multicellular animals.
细胞凋亡是机体正常的生理机能，是多细胞生物正常更新和清除异常细胞的重要手段。
Apoptosis, which is the basically physiological mechanism, is important on renewing the normal cells and eliminating the abnormal cells for the multicellular organism.
他在老鼠上使用胚胎干细胞研究机制调节和器官形成。胚胎干细胞能形成身体部位的多细胞。
She had been researching mechanisms regulating early development and organ formation in mice using embryonic stem cells, which can develop into the multitude of cells that make body parts.
而当科学家们确实在深海发现这种多细胞有机生物时，他们曾猜想这些生物是从富氧水域沉降而来的。
When scientists did find multicellular organisms, they assumed that they'd sunk from oxygen-enriched waters.
我们不能肯定盘藻、实球藻、空球藻和杂球藻代表从单细胞衣藻到多细胞因藻的各进化阶段。
We cannot be certain that Gonium, pandonina, Eudonna, and Pleodorina represent stages in the evolution of multicellular Volvox from unicellular chlamydomonas.
然而与进化上更古老的单细胞生物如细菌相比这些多细胞生命面临着一个非常不同的生理挑战。
But there was still a very different physiological challenge for these organisms than for the more evolutionarily ancient single-celled organisms such as bacteria.
但这之后又经过了14亿年才出现了最早的多细胞生命体——卷曲藻(Grypania)的化石记录。
But it was another 1.4 billion years before the first truly multicellular organism, called Grypania spiralis, appears in the fossil record.
这些生物不到1毫米长，是属于铠甲动物门的多细胞生物。从某些方面来看，它们与水母相似。
These creatures, which measure less than 1 millimeter long, are known as loriciferans. They somewhat resemble jellyfish sprouting from a conical shell.
毫无疑问，几乎所有的多细胞生物中都发现了癌症，这暗示着癌症的起源可以追溯到数百万年前。
Sure enough, cancer is found in almost all multicellular organisms, suggesting its origins stretch back hundreds of millions of years.
毫无疑问，几乎所有的多细胞生物中都发现了癌症，这暗示着癌症的起源可以追溯到数百万年前。
Sure enough, cancer is found in almost all multicellular organisms, suggesting its origins stretch back hundreds of millions of years.
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