首页
登录
职称英语
How Deer Survive Winter Like most of the wild animals, de
How Deer Survive Winter Like most of the wild animals, de
游客
2023-12-08
10
管理
问题
How Deer Survive Winter
Like most of the wild animals, deer survive the cold winter by
using energy stored in the summer and fall, usually in the form of【1】【1】______
______. They also spend【2】______energy in winter than in 【2】______
summer.
Deer always give birth to their fawns in May or June. This
is good【3】______, because it coincides with the time when【3】______
plenty of new plants are available. The’ mother deer must have
enough food both to meet the needs of their own bodies and to【4】______
produce【4】______for their fawns. As the fawns grow, they
become less and less【5】______on their mothers. As winter 【5】______
comes, deer’s hair becomes darker and【6】______. Besides, 【6】______
nature provides another【7】______to help them survive the 【7】______
cold weather. They become somewhat slow and drowsy. Their
heart rate【8】______This is an internal physiological 【8】______
response which is to【9】______their cost of energy. 【9】______
All these practices and responses that increase deer’s
chances of survival in winter are the result of thousands Of years
of【10】______. 【10】______ [br] 【6】
How Deer Survive Winter
We know that in summer and fall, when there is plenty of food, wild animals will eat as much as they can. So, besides the energy spent on maintaining their normal activities, there is some excess. They store the excess in the form of fat, and then in winter when food is scarce, they use these reserves of fat to survive. In addition to this nature also provides other safeguards for wild animals to survive.
This is the way through which deer survive winter. Like most wild animals, deer reproduce, grow, and store fat in summer and fall when there is plenty of nutritious food available. A physically mature female deer in good condition who has conceived in November and given birth to two fawns during the end of May or the beginning of June, must get enough food to not only meet her own body’s needs but also to produce milk for her fawns. The best milk production occurs at the same time that new plant growth is available. This is good timing, because milk production is an energy consuming process—it requires a lot of food. The cost can not be met unless the region has ample food resources.
As the summer progresses and the fawns grow, they become less dependent on their mother’s milk and more dependent on growing plants ’as food sources. The adult males spend the summer growing antlers and getting fat. Both males and females continue to eat high quality food in fall in order to deposit body fat for winter. Fat reserves are like bank accounts to be drawn on in winter when food supplies are limited and sometimes difficult to reach because of deep snow.
As fall turns into winter, other changes take place. Fawns lose their spotted coat. Hair on all the deer becomes darker and thicker. The change in the hair coats is usually complete by September and maximum hair depths are reached by November or December when the weather becomes cold.
But in addition, nature provides a further safeguard to help deer survive the winter. This is an internal physiological response which lowers their metabolism, or rate of bodily functioning, and hence slows down their expenditure of energy. The deer become somewhat slow and drowsy. The heart rate drops. Hibernating animals such as snakes and bears practiced the energy conservation in winter to a greater degree than deer do. Although deer don’t hibernate, they have the same energy saving and spending rhythm to keep in pace with nature’s seasonal changes.
So, we can see that deer spend more energy and store fat in the summer and fall when food is abundant, and spend less energy and use stored fat in the Winter when food is less available. Meanwhile, in winter they reduce their activity, grow a thicker coat of hair, and reduce their metabolism. The reduction in the cost of energy is meant to increase their chances of living. This internal biological response is obtained through thousands of years of evolution. The cruel rule of evolution Survival of the Fittest—will see to it that the deer, as well as any other animal get this gift from nature.
If the winter has light snow, deer’s survival and productivity in the next spring will be high. But if deep snows come and the weather remains cold for several weeks, then the deer must spend more energy to move about, food will be harder to find, and they must then depend more on their fat reseryes to pull them through. If such conditions go on for too long, some will die, and only the largest and strongest are likely to survive. That is the fundamental rule of life for wild, free wandering animals such as deer.
选项
答案
thicker
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3255996.html
相关试题推荐
WhydidMr.Greenhaveaterriblefuelbilllastwinter?[br][originaltext]Mr.
WhydidMr.Greenhaveaterriblefuelbilllastwinter?[originaltext]Mr.Green
【B1】[br]【B9】conditional→unconditional从后文animalsdosomanyforusandaskfor
Thefamousline"Ifwintercomes,canspringbefarbehind?"isfrom______’spo
HowDeerSurviveWinterLikemostofthewildanimals,de
HowDeerSurviveWinterLikemostofthewildanimals,de
HowDeerSurviveWinterLikemostofthewildanimals,de
HowDeerSurviveWinterLikemostofthewildanimals,de
HowDeerSurviveWinterLikemostofthewildanimals,de
HowDeerSurviveWinterLikemostofthewildanimals,de
随机试题
[originaltext](19)Thefirstmoderndigitalcomputersweredevelopedinthe1940
以下属于质量计划的编制要求的有()。A.安装和调试的过程控制 B.检(试)验
布鲁司杆菌感染人体后,使机体的热型呈波浪式是因为()A.内毒素的释放 B.
操作风险资本应该为( )提供保障。A.预期损失 B.非预期损失 C.意外损
某社区今年有许多高三学生要参加高考,现在他们都承受着巨大的压力,不知道怎么选择学
下列有关饮食治疗的说明,错误的是( )。A.是糖尿病最基本的治疗方法 B.饮
第一家证券投资基金诞生于()。A:美国B:英国C:德国D:法国
净资本的计算公式为:净资本=净资产+资产调整值-负债调整值-/+其他调整项( )
(2018年真题)以土地使用权为抵押标的设立的抵押,其抵押合同( )。A.自合
(2021年真题)隧道工程施工中,干式喷射混凝土作业方法的主要特点为()。
最新回复
(
0
)