There are positive changes that should be implemented in the rearing of animals.
应该积极改变动物的饲养方式。
These animals were not as sensitive to climate changes in the Cretaceous period as they are today.
这些动物在白垩纪对气候变化不像今天这样敏感。
Studies of animals, for example, have shown that when a rat experiences stress during pregnancy, it can cause epigenetic changes in a fetus that lead to behavioral problems as the rodent grows up.
例如，对动物的研究表明，老鼠在怀孕期间经历压力会导致胎儿表观遗传发生变化，进而导致啮齿动物在成长过程中出现行为问题。
But soon they also gained genetic control of the animals, which led to rapid physical changes in the herd.
但他们很快也获得了对动物的遗传控制，这导致了兽群的快速生理变化。
Increases in seeds from pioneer plants and systematic changes in the animals hunted are evidence of environmental degradation.
先锋植物种子的增加和被猎杀动物的系统性变化是环境退化的证据。
Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.
先锋植物种子的增加，被猎杀的动物以及用于建筑和燃料的树木系统的变化是环境退化的证据。
The areas that are now desert were, like all arid regions, very susceptible to cycles of higher and lower levels of rainfall, resulting in major, sudden changes in distributions of plants and animals.
那片现在是沙漠的地区和所有干旱地区一样，对降雨量相对更大或更小的周期极为敏感，因此那里的动植物分布发生了巨大且迅速的变化。
With the changes in the world's climate, dinosaurs died, but many smaller animals lived on. It was the survival of the fittest.
随着世界气候的变迁，恐龙绝迹了，但许多较小的动物却继续活了下来。这就是适者生存。
It is melatonin that triggers many of the changes needed for animals to adapt to winter - and it also plays an important part in sleep.
正是褪黑激素的作用，才能使动物适应冬季的许多变化——而且它在睡眠中也起着重要作用。
Migration could reduce the amount of disease as infected animals are left behind to die, but changes in migration might prevent such natural purging of infections, the review says.
这份综述说，随着被感染的动物掉队死亡，迁徙可能减少疾病数量，但是迁徙的变化可能阻止这种天然的防止感染的措施。
Thousands of years of selective breeding have produced extensive genetic changes in the plants and animals we eat, not all of them good.
数千年的选择性培育已经造成了食用植物和动物广泛的基因改变，并非所有的改变都是好的。
Scientists have already carried out research which has showed lifespan of many animals can be dramatically extended by making minute changes in single genes.
科学家们已经展开了各种研究，通过略微改变某个单一基因而在很大程度上延长不同动物的生命周期。
Longer term changes in climate affect the viability and health of ecosystems, influencing shifts in the distribution of plants, pathogens, animals, and even human settlements.
较长期的气候变化可影响生态系统的生存能力和健康，使植物、病原体、动物、甚至人类住区的分布状况发生变化。
Some also suggest that animals detect changes in the air or in electromagnetic fields.
另外一部分科学家则认为动物能够察觉空气或者电磁场里发生地变化。
Although the four other Big Five extinction events led to huge changes in which animals rose to prominence, the same animals that dominated before the end-Ordovician dominated afterward.
其它四次大灭绝对生物进化产生了巨大的影响，动物因此逐渐处于优势地位，但是，奥陶纪末期大灭绝发生前后，处于支配地位的动物物种没有发生变化。
"It is known that animals with disrupted circadian rhythms develop metabolic changes that, if they occurred in people, would increase heart disease risk," Fisher said.
“据了解，昼夜节律被打乱的生物会产生新陈代谢变化，如果发生在人身上，就会增加心脏病的风险。”Fisher说。
This part of the evolutionary tree is very sensitive to small changes in how we interpret the anatomy and the combination of anatomical features we see in these animals as they are discovered.
进化树上的这一部分对我们如何解释结构特征的分解和组合变得非常敏感，对当它们被发现时我们看待它们结构特征的小小改变变得非常敏感。
The benefit from such research would be in duplicating the sensory responses of animals to construct equally responsive instruments that can record or monitor these precursory changes.
这些实验旨在利用动物的感官反应制造出同样具有次感觉的仪器以记录和监测地震前的变化。
This was the first study ever to measure the baseline D2 levels of animals that had never used cocaine and compare those levels to changes in D2 receptors after the animals had started using.
这项研究首次检测了从未用过可卡因的动物的D2受体基线水平，并比较了应用可卡因后这些动物d 2受体的变化，在人体进行这种比较是不可能的。
Most animals and plants are sensitive to large or sudden changes in temperature.
大多数的动物和植物对温度的大的或突然的改变非常敏感。
Humans and other animals in close contact with the birds may be infected, and the virus begins to adapt to new host animals, a process that may take years as small changes accumulate.
与鸟类有密切接触的人类和其它动物可能被感染，禽流感病毒开始适应新的宿主，病毒微小的变异慢慢累积，这个过程持续多年。
First, we have to understand the main features of the film with the film: it is good to show the characters or animals in the dynamic changes in the expression and personality characteristics.
我们先来了解一下跟拍的主要功能：有利于展示人物或动物在动态中的神情变化和性格特点。
Scientists have known of a link between body temperature and aging in cold-blooded animals, but this was the first study to show body temperature changes impact how long warm-blooded animals live.
科学家们已经知道冷血动物的体温和衰老之间的联系，但是这项最初的研究只是表明体温的改变可以影响温血动物的寿命。
However, the dynamic changes of anti-Trichinella antibodies in muscle juice samples of infected animals are not reported.
然而，关于动物感染旋毛虫后肉汁中抗体水平的动态变化尚未见报道。
They've identified molecular changes in the brains of aging mice that prevent learning and memory genes from being switched on as they are in younger animals.
在年老小鼠的大脑内，研究者鉴别到一种分子发生了变化，而这种变化阻碍了学习和记忆基因的开启，而年轻时这种情况是不存在的。
The drugs also have been linked to heart rhythm changes in laboratory animals.
这个药物在实验动物身上引起心脏节律的改变。
The drugs also have been linked to heart rhythm changes in laboratory animals.
这个药物在实验动物身上引起心脏节律的改变。
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