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
86
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 savanna elephant weighs roughly three times the weight of the forest elephant.
选项
A、TRUE
B、FALSE
C、Not Given
答案
B
解析
题干要求判断热带草原大象的体重是否大约是森林大象体重的三倍。文中第六段提到了具体的信息“The savanna elephant weighs between six and seven tons roughly double the weight of the forest elephant”,热带草原大象的体重是森林大象的两倍,不是三倍,所以题干表述是错误的。
转载请注明原文地址:https://kaotiyun.com/show/NakR777K
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
ShoppingandHealthManypeoplebelievethatshopping(shop)isabadhabit.However,arecentTimemagazinesuggeststhatth
ShoppingandHealthManypeoplebelievethatshopping(shop)isabadhabit.However,arecentTimemagazinesuggeststhatth
ManageYour"High-tech"Family①Modernfamilylifeisimprovedonmanylevelsbynumerousadvancesintechnology.However,s
ManageYour"High-tech"Family①Modernfamilylifeisimprovedonmanylevelsbynumerousadvancesintechnology.However,s
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanother
"SubstanceAbuse"—SevereAnxietytoSocietyTechnically,anysubstanceotherthanfoodthataltersourbodilyor【W1】______fun
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanothe
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanothe
HeritageHomeSchoolChildrenareourfuture,andit’suptoustoarmthemwiththetoolstosucceed.Sadly,today’schil
HeritageHomeSchoolChildrenareourfuture,andit’suptoustoarmthemwiththetoolstosucceed.Sadly,today’schil
随机试题
组成复方新诺明的药物是
隧道施工中进行煤层瓦斯预报时,接近煤层前,必须对煤层位置进行超前钻探,标定各煤层准确位置,掌握其赋存情况及瓦斯状况。在距初探煤层10m(垂距)处的开挖工作面上应钻()个超前钻孔。
建设项目评价中的总投资包括()。
建筑安装工程质量验收评定是()。
下列选项中,()确定的准确与否直接影响标价中成本的准确性,是影响投标成败的重要因素。
()是指交易双方以协商确定的汇率交换两种货币,并在交易之时起的两个交易日内进行现汇交割的外汇交易。
某企业2015年书立了以下合同:向某公司租赁设备一台,合同记载年租金10万元,租期未定;接受甲公司委托加工一批产品,加工承揽合同中注明甲公司提供原材料金额180万元,支付加工费金额20万元。该企业2015年应纳印花税()元。
20×1年11月20日,甲公司购进一台需要安装的A设备,取得的增值税专用发票注明的设备价款为950万元,可抵扣增值税进项税额为161.5万元,款项已通过银行支付。安装A设备时,甲公司领用原材料36万元(不合增值税额),支付安装人员工资14万元。20×1年1
设X与Y独立,下表列出(X,Y)的联合分布列和关于X、Y的边缘分布列中的部分数值,请填上空白处,并填空求P(X+Y≤1)=_______.P{X+Y≤1|X≤0}=_______.
IwillgohomeforthevacationassoonasI______myexams.
最新回复
(
0
)