首页
登录
职称英语
One of Nature’s most exciting mysteries is how pigeons find their way home o
One of Nature’s most exciting mysteries is how pigeons find their way home o
游客
2023-10-10
53
管理
问题
One of Nature’s most exciting mysteries is how pigeons find their way home over vast distances. Now German scientists believe they have discovered how the birds do it. Research has revealed that tiny iron structures in their beaky(鸟嘴)allow them to analyze the earth’s magnetic field—much like a compass(罗盘). Through the signals picked up, the birds can work out where they are and set out on the best course home.
As well as pigeons, many other birds display a remarkable ability to fly thousands of miles to return to a specific garden or tree year after year. Scientists are suggesting they may have similar iron-containing cells in their beaks.
In the past, experts have suggested the birds use the sun and stars to navigate, although in 2004 researchers found that many follow roads rather than their internal compass to plan their route. However, scientists have long believed that they can in some way use the natural magnetism of the earth to navigate. The recent study by German scientists has revealed how this may be possible.
The research used X-rays to examine the upper beaks of pigeons. They found that within the skin lining are tiny iron-containirg particles(微粒)in nerve branches which are arranged in a 3D pattern. The team, led by Gerta Fleissner, concluded that this allows the birds to react to the external magnetic field of the planet and work out their precise location.
She pointed out that similar iron-containing cells had been found in the beaks of robins, warblers and chickens so it may well turn out to be the way that other species also navigate.
Scientists are still discovering more about the incredible abilities of the pigeon.
Questions: [br] Like pigeons, other birds can return home, because their beaks have______.
选项
答案
similar iron-containing cells
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3087405.html
相关试题推荐
Morethanthreenaturereserveshavebeenestablishedinthisarea______huntin
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
OneofNature’smostexcitingmysteriesishowpigeonsfindtheirwayhomeo
Thecountryisveryrichinits(nature)______resources,whichincludeforests
[audioFiles]audio_ehbm_j16002(20082)[/audioFiles]A、Veryexciting.B、Quiteinter
随机试题
"Didyouwaitforhimverylong?""Yes,I______tobeduntilfiveinthemornin
[img]2021m3x/ct_ve01004002m_eyyjsbcloze_0250_202103[/img]Lastweek,onB
[originaltext]W:Tony,you’dbettereatlessanddosomeexercise,andthenyouw
疏散走道是疏散时人员从房间内至房间门,或从房间门至疏散楼梯或外部出口等安全出口的
某建筑的排水系统如图所示,各层排水横支管通过45°斜三通与排水立管连接,则其排水
以下哪些肺功能指标同时改变才符合慢性阻塞性肺疾病(COPD)的诊断:()A.
下列食物蛋白质属于不完全蛋白的是( )。A.乳类 B.蛋类 C.瘦肉 D
隔山消的功效是A.既消食又回乳 B.既消食又活血 C.既消食又化痰 D.既
公司制期货交易所设监事会,成员不得少于()人。A.5 B.3 C.2
根据企业所得税法律制度的规定,下列各项中,属于不征税收入的是()。A.依
最新回复
(
0
)