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
自考
A New Study on Elephants A recent study of ancient and modern elephants has come up with the unexpected conclusion that the A
A New Study on Elephants A recent study of ancient and modern elephants has come up with the unexpected conclusion that the A
admin
2019-08-15
95
问题
A New Study on Elephants
A recent study of ancient and modern elephants has come up with the unexpected conclusion that the African elephant is divided into two distinct (不同的) species.
The discovery was made by researchers at York and Harvard universities when they were examining the genetic (基因的) relationship between the ancient woolly mammoth and mastodon to modern elephants—the Asian elephant, African forest elephant and African savanna (热带草原) elephant.
Once they obtained DNA sequences from two fossils (化石) , mammoths and mastodons. The team compared them with DNA from modern elephants. They found to their amazement that modern forest and savanna elephants are as distinct from each other as Asian elephants and mammoths.
The scientists used detailed genetic analysis to prove that the African savanna elephants and the African forest elephants have been distinct species for several million years. The divergence (分离)of the two species took place around the time of the divergence of Asian elephants and woolly mammoths. This result amazed all the scientists.
There has long been debate in the scientific community that the two might be separate species but this is the most convincing scientific evidence so far that they are indeed different species.
Previously, many naturalists believed that African savanna elephants and African forest elephants were two populations of the same species despite the elephants’ significant size differences. The savanna elephant has an average shoulder height of 3. 5 metres while the forest elephant has an average shoulder height of 2. 5metres. The savanna elephant weighs between six and seven tons, roughly double the weight of the forest elephant. But the fact that they look so different does not necessarily mean they are different species. However, the proof lay in the analysis of the DNA.
Alfred Roca, assistant professor in the department of Animal Sciences at the University of Minois, said, " We now have to treat the forest and savanna elephants as two different units for conservation purpose. Since 1950 all African elephants have been conserved as one species. Now that we know the forest and savanna elephants are two very distinct animals, the forest elephant should become a bigger priority (优先)for conservation purpose. "
The divergence of the African savanna elephants and the African forest elephants took place long before the time of the divergence of Asian elephants and woolly mammoths.
选项
A、TRUE
B、FALSE
C、Not Given
答案
B
解析
题干要求判断非洲热带草原大象和非洲森林大象的分离是否比亚洲大象和长毛猛犸象分离的时间要早很多。文中第四段涉及了这个细节,“The divergence of the two species took place around the time of the divergence of Asian elephants and wooly mammoths”,分离发生的时间与亚洲大象和长毛猛犸象分离的时间大致一致,所以题干表述是错误的。
转载请注明原文地址:https://www.kaotiyun.com/show/yakR777K
本试题收录于:
英语(一)题库公共课分类
0
英语(一)
公共课
相关试题推荐
我国可豁免上市申请与审查的债券是()
ShoppingandHealthManypeoplebelievethatshopping(shop)isabadhabit.However,arecentTimemagazinesuggeststhatth
ANewStudyonElephantsArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthattheA
ANewStudyonElephantsArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthattheA
"SubstanceAbuse"—SevereAnxietytoSocietyTechnically,anysubstanceotherthanfoodthataltersourbodilyor【W1】______fun
WhatWillManBeLikeintheFutureWhatwillmanbelikeinthefuture—in5,000oreven50,000yearsfromnow?Wecanonl
HeritageHomeSchoolChildrenareourfuture,andit’suptoustoarmthemwiththetoolstosucceed.Sadly,today’schild
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanothe
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanothe
随机试题
请你自拟信息,写一份邀请信。要求:(1)格式正确;(2)信息量充分;(3)语言规范,表达准确;(4)字数在100左右。
关于石油沥青延度试验,说法错误的是()。
某烟花爆竹厂因生产经营需要,临时招聘了一批搬运工,负责烟花爆竹的搬运工作。这些临时搬运工正式上岗作业前,必须经过()考核合格,取得相应的合格证书。
当理财规划师执业时触犯了法律的规定,行业自律机构通常会对理财规划师采取( )制裁措施。
债券投资的收入一般通过债券的收益率进行衡量,通常用年率表示,包括()。
某零售企业在十几年的经营中通过对国内外零售企业进行考察学习,并不断对自身经验进行总结,制定出一套科学成功的选址程序:在每开设一家新店前,都要利用一年左右的时间对所在区域的人员构成、消费水平、人口增长、居住条件、消费者兴趣爱好、高收入人群比例等进行细致的市场
“孟母三迁”体现了什么样的德育方法?()
人非生而知之者,孰能无惑?惑而不从师,其为惑也,终不解矣。生乎吾前,其闻道也固先乎吾,吾从而师之;生乎吾后,其闻道也亦先乎吾,吾从而师之。吾师道也,夫庸知其年之先后生于吾乎?是故无贵无贱,无长无少,道之所存,师之所存也。
将考生文件夹下RAS\GGG文件夹中的文件MENTS.DOC设置成只读属性。
太原是华北地区重要的历史城市。它坐落于山西省的中部,四周环山,气候温和。太原矿藏和农产品丰富,景色优美。由于历史悠久,名胜古迹遍布太原。金纪念塔(JinMemorialTemple)是为了纪念金国第一个皇帝而建的,因其辉煌的宋代建筑和华美的花园而闻名于
最新回复
(
0
)