The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.
植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。
SB and PB have a broad host range, from single-celled organisms to higher mammals.
SB和PB宿主范围极其广泛，从单细胞生物到高等哺乳动物都能够发挥作用。
Single-celled organisms emerged from the primordial soup about 3.4 billion years ago.
单细胞生物大约出现于34亿年前的“原始汤”（primordial soup）。
But they don't beat single-celled organisms that emerged about 3.4 billion years ago.
但是没有34亿年前出现的单细胞生物的历史久。
Now experiments have revealed that the single-celled organisms are, even for microbes, incredibly small.
目前，实验证明：被发现的单细胞有机体，甚至是微生物，都是极小的。
Scientists are also discovering that our nervous system shares an even deeper homology with single-celled organisms.
科学家们甚至还发现我们的神经系统和单细胞生物有着更为深层次的同源性。
"Pain is probably the earliest most primitive experience around, going all the way back to single celled organisms," he says.
“疼痛可能是最早的也是最原始的体验，回归到最简单的我们称之为有机体的东西，”他说到。
These "biotic games" involve a variety of basic biological processes and some simple single-celled organisms, such as paramecia.
这种游戏牵涉到一系列基本的生物学过程，使用的是一些简单的单细胞有机体，如草履虫。
Scientists have known for some time that life exists at such depths, but they thought it mostly consisted of single-celled organisms.
科学家们早已知道在这一深度存在有生命，但他们认为存在的主要是单细胞生物。
There are five kingdoms: animals, plants, fungi, chromists—including one-celled plants such as diatoms—and protozoa, or one-celled organisms.
归有五个界：动物界、植物界、真菌界、茸鞭生物界——包括单细胞植物，如硅藻——和原生动物界，或单细胞生物体。
Algae range in size from single-celled organisms to giant kelp plants. Some live near the surface of the ocean, and these algae need nitrogen to grow.
海藻包括小到单细胞有机体、大到巨型褐藻的多种类型植物，有些海藻生长于海面附近，依赖氮元素成长。
They pointed out that because bacteria constantly reproduce, a group of the single-celled organisms could store a piece of information for thousands of years.
他们指出，由于细菌不断繁殖，一条信息可以在单细胞有机体中储存数千年。
Researchers had thought that only single-celled organisms such as prokaryotes and protozoa could live in the oxygen-deprived environments of the deepest ocean.
研究人员一度以为，只有单细胞生物，如原核生物和原生动物，才能在深海缺氧环境中生活。
Researchers had thought that only single-celled organisms such as prokaryotes and protozoa could live in the oxygen-deprived environments of the deepest ocean.
研究人过去一直认为，只有原核生物和原生生物这样的单细胞生物才能够在深海的缺氧环境中生存。
But there was still a very different physiological challenge for these organisms than for the more evolutionarily ancient single-celled organisms such as bacteria.
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。
In short, all living things are developments from these one-celled organisms. They have developed step by step through change upon change from these first, simple, living things.
简而言之，所有的生物都是这些单细胞生物体的后代，它们是从这些最早的、简单的生物体经过逐步演变进化而来的。
Any form of life we find there, we won't have encountered before - there will probably be viruses, and we may have bacteria, archaea (other single-celled organisms) and... maybe fungi.
我们在那里发现的任何生命形式，以前都不曾见过——可能有病毒，我们还可能会发现细菌、古代细菌(其他单细胞生物)以及…真菌也有可能。
The fossils buried in Pleistocene and earlier ocean sediments were of foraminifera—small, single-celled marine organisms that secrete shells of calcium carbonate, or calcite.
在更新世和更早的海洋沉积物中埋藏的化石生物属于孔虫类生物，它们是微小的单细胞海洋生物，其分泌的硬壳由碳酸钙和方解石组成。
The discovery of life-forms so deep underground strengthens the notion that most of the organisms on the planet are in fact hardy, single-celled creatures that live in the rock beneath our feet.
在如此深的地下发现生命再次表明了我们星球上大多数生物是生活在我们脚下岩石中强悍的单细胞生物。
The single-celled photosynthetic organisms produce much of the oxygen on earth and are the base of the marine food chain.
地球上多数的氧气都是这些单细胞光合作用的生命制造的，他们还是海洋食物链的基础。
The two organisms used in this study, the single-celled budding yeast and the roundworm C. elegans, are commonly used models for aging research.
在这项研究中用的两种生物，单细胞芽殖酵母和秀丽隐杆线虫，是研究老化过程的常用模式。
Algae is a name for thousands of different organisms. They include single-celled plants as well as kelp and other large plants.
藻是几千种不同有生物的总称，包括单细胞植物，也包括大型褐藻和其他大型植物。
Dinoflagellates are single-celled and primitive Marine organisms.
沟鞭藻为单细胞的原始的海洋生物。
Dinoflagellates are single-celled and primitive Marine organisms.
沟鞭藻为单细胞的原始的海洋生物。
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