首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
How Deer Survive Winter Like most of the wild animals, deer survive the cold winter by using energy stored in the summer and
How Deer Survive Winter Like most of the wild animals, deer survive the cold winter by using energy stored in the summer and
admin
2014-06-02
77
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】______
【5】
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
dependent
解析
转载请注明原文地址:https://kaotiyun.com/show/F8pO777K
0
专业英语八级
相关试题推荐
在民俗村除了可饱览各民族的建筑风格外,还可欣赏中国名山大川中的二十个著名景观。这些景观有四个达到“世界之最”的水平:世界最大的人造石林、最大的人造榕树、最大的人造瀑布、最大的人造溶洞。面积达两万五千平方米的人造石林,精心选择了云南石林的“梁祝相会”
Whatistherelationshipbetweenthewords"color"and"red"?
______isconcernedwiththesocialsignificanceoflanguagevariationandlanguageuseindifferentspeechcommunities.
OnlineShoppingNowadays,Internetshoppingisbecomingapowerfulalternativetotraditionalstorefrontshopping,duetoit
WinstonChurchillChurchillcamefromamilitaryfamilyandenteredthearmyasacavalryofficer.Between1895and1898he
EducationalValuesDuringthefirstweekatNorthAmericanuniversities,studentsmustdoafewthingsinpreparation,solif
得病以前,我受父母宠爱,在家中横行霸道,一旦隔离,拘禁在花园山坡上一幢小房子里,我顿感打入冷宫,十分郁郁不得志起来。一个春天的傍晚,园中百花怒放,父母在园中设宴,一时宾客云集,笑语四溢。我在山坡的小屋里,悄悄掀起窗帘,窥见园中大千世界,一片繁华,自己的哥姐
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithseparatesexes,approximatelyequalnumbersofmalesa
Iknownowthatthemanwhosatwithmeontheoldwoodenstairsthathotsummernightoverthirty-fiveyearsagowasnotatall
多极化趋势正在全球范围内继续发展。各种重要力量相互依存,相互制约,相互合作,有利于世界的和平与稳定。全球有近二百个国家。国家不论大小、贫富、强弱,都是国际大家庭的平等成员。世界和平要靠各国人民的共同努力。世界事务应由世界各国共同参与。我们生活在一个丰富多彩
随机试题
患者,男,45岁。胸痛2小时就诊,诊断为急性心肌梗死,由于医院条件限制,拟行溶栓治疗。若患者有以下病史,则不能行溶栓治疗,其中不包括
甲型肝炎病毒的核酸类型是
A.急性黄疸型肝炎B.急性无黄疸型肝炎C.急性重型肝炎D.慢性迁延性肝炎E.慢性活动性肝炎扑翼样震颤见于
患者,男,20岁,诊断为破伤风,抽搐频繁,引起肘关节脱臼,呼吸道分泌物多,有窒息的可能,此时应首先处理的是()
《城市国有土地使用权出让转让规划管理办法》的适用范围是()。
海关在查验时()。与合同不符的两箱产品旺海公司预退货时应()。
上市公司董事会就该重大事件形成决议时,应当及时履行重大事件的信息披露义务。这里所说的及时是指()。
清朝统一天山南北后,为对这一地区行使有效的军政管理,1762年设置了______。
以下属于教师在从事教育工作的过程中依法享有的基本权利的是()。
Onedaymorning,IwithmotherwenttothePeople’sHospitalin【M1】______Shandongbecauseshehadcaughtabadcold.Whilewes
最新回复
(
0
)