One species of tree replaces another as a forest ages.
随着森林老化，一种树会取代另一种树。
The female of one species of firefly has learned to imitate the moves of another.
一种萤火虫的雌性学会了模仿另一种萤火虫的动作。
Commensal associations sometimes involve one species' obtaining food that is inadvertently exposed by another.
共生关系有时候表现为：一个物种寻觅的食物会经由另外一个物种不经意地暴露出来。
There's one species of snake, the brown tree snake, that uses both constriction and venom, depending on its prey.
有一种蛇——棕树蛇——会根据猎物的不同，同时使用毒液和挤压的方法来杀死猎物。
Most researchers expect to find that both modes of transition from one species to another are at work in evolution.
大多数研究人员希望发现从一个物种到另一个物种的两种转变模式都在进化中起作用。
A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species.
共生关系是两个或多个物种之间的相互作用，其中一个物种生活在另一个物种体内，或依靠这一物种生活。
There are striking differences in life span between different species, but within one species the parameter is relatively constant.
不同物种之间的寿命存在显著差异，但在同一物种内，这一参数是相对稳定的。
If more than one species is competing for a scarce resource, the competing species usually switch to different alternative resources.
如果一个以上的物种竞争稀缺的资源，竞争的物种通常会转向不同的替代资源。
According to this definition, one species is distinguished from another by the possibility of matings between individuals from each species to produce fertile offspring.
根据这一定义，区分不同物种的标准是不同物种的个体间相互交配产生可育后代的可能性。
Like most amphibians these begin life in a juvenile "tadpole" state, then metamorphose into the adult form — except for one species, the axolotl, which famously lives its entire life as a juvenile.
像大多数的两栖动物一样，它们从幼年的“蝌蚪”状态蜕变成成年的形式——蝾螈这个物种除外，众所周知，它一生都处于幼年状态。
Species interdependence in nature confers many benefits on the species involved, but it can also become a point of weakness when one species involved in the relationship is affected by a catastrophe.
在自然界中，物种的相互依赖给相关物种带来了许多好处，但当其中一个物种受到灾难的影响时，这种依赖也可能成为一个弱点。
The problem is that competition ordinarily cannot be observed directly but must be inferred from the spread or increase of one species and the concurrent reduction or disappearance of another species.
问题是，人们通常不能直接观察竞争，而必须从一个物种的扩展或增加和同时另一个物种的减少或消失来推断。
Two species enter ... One species leaves.
两个物种进去……一个物种存活。
In there he tells of one species of snake that has a head at both ends.
在资料中他提到一种两端都是头的双头蛇。
Domestic cats, no matter their breed, are all members of one species.
无论家猫有多少品种，它们都属同一物种。
One species of ant belongs to a genus that is only found alive today in Australia.
一种蚂蚁属于一个今天只有在澳大利亚还存在的属。
One species Stolzenburg focuses on is the kakapo, a large, green, nocturnal parrot that is found only in New Zealand.
Stolzenburg关注的一个物种叫鸮鹦鹉（Kakapo）。 鸮鹦鹉是一种夜间活动的大型绿色鹦鹉，只在新西兰有发现。
In Costa Rica, for example, the two most closely related species differ in color: One species is white and the other is yellow.
例如在哥斯达黎加，两种种群最接近的蝴蝶在颜色上存在差异：一种是白色，而另一种是黄色。
Plenty of experiments, albeit accidental ones, have already demonstrated that subtracting even one species can change an eco-system.
许多实验，除个别例外，已证明即使是一个物种的减少也能改变一个生态系统。
Taxonomists do not always get it right first time, of course, and what looked like one species may rightly later be seen as two.
当然，物种分类学不可能一步到位，以前曾被归为是同一物种的生物，按新的定义就有可能就被修正2个物种。
However there is one species of pond snail, Lymnaea stagnalis, which demonstrates examples of both clockwise or anticlockwise spiralling shells.
然而，有一种叫做“静水椎实螺”的田螺，它是同时拥有顺时针和逆时针螺壳的典型代表。
The precise frequency and nature of these disturbing effects varies from one species to another and may vary with the cloning procedure that is used.
精确的频率和这些自然的令人不安的影响来自于一个品种变成另一个品种，以及那些用过的克隆程序带来的各种变化。
And we simply asked the question, if one species needs 800, another 500, is there a smaller set of genes that might comprise a minimal operating system?
我们提出疑问，如果一个物种需要800个基因，另一种只需要500个基因，是否可以用更少的基因组成一个微小的可运作生命系统？
Scientists have found that by injecting stem cells into the embryo of one species, they can create animals that have organs belonging to another species.
科学家们发现，向一种物种的胚胎中注射干细胞，这种物种就会长出另外一个物种的器官。
Marine reserves are common in the tropics, butpolicymakers in temperate countries tend to focus on one species at atime to control numbers of that species caught.
海洋资源在热带地区是共有的，但是温带地区国家的政策制定者们往往一次只重视对某一个物种的捕捞量进行控制。
The public debate on plant genetics focuses almost entirely on the pros and cons (mostly cons) of genetic modification—putting a gene from one species into another.
公众对于植物基因学的争论几乎全部聚焦于转基因的正负两个方面的影响，绝大多数是负面影响。 转基因通常就是把一个种属的基因注入到里一个种属里。
Paabo acknowledges the complexity of finding new hominids in mitochondrial DNA, which in animals such as mice can pass from one species to another via interbreeding.
paabo承认在线粒体dna中找寻新的史前人类是很复杂的，因为在动物世界中，比如老鼠，物种可以通过杂交从一个传到另一个。
The grape varieties whose wine we like to drink - merlot, chardonnay, semillon, riesling and the rest - have mainly been developed from one species, Vitis vinifera.
至今，我们有很多葡萄酒品种——梅洛，莎当妮，赛美蓉，雷司令等等，还有其他的很多很多；并且这些葡萄酒所使用的葡萄大多数属于同一个种类，那就是欧亚葡萄。
It's the first in our planet's history where one species - ours - has Earth's future in its hands, and could jeopardise not only itself, but life's immense potential.
在我们地球的历史上，这是第一次有一个物种——我们的人类——掌握了地球的未来，不仅可能危及其本身，而且可能危及生命的巨大潜力。
It's the first in our planet's history where one species - ours - has Earth's future in its hands, and could jeopardise not only itself, but life's immense potential.
在我们地球的历史上，这是第一次有一个物种——我们的人类——掌握了地球的未来，不仅可能危及其本身，而且可能危及生命的巨大潜力。
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