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
48
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
ShoppingandHealthManypeoplebelievethatshopping(shop)isabadhabit.However,arecentTimemagazinesuggeststhatth
ANewStudyonElephantsArecentstudyofancientandmodernelephantshascomeupwiththeunexpectedconclusionthattheA
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanother
NuclearPowerIsnuclearpowerreallyamonster?No,definitelynot.Firstofall,nuclearpowerismuchsaferthanother
"SubstanceAbuse"—SevereAnxietytoSocietyTechnically,anysubstanceotherthanfoodthataltersourbodilyor【W1】______fun
HeritageHomeSchoolChildrenareourfuture,andit’suptoustoarmthemwiththetoolstosucceed.Sadly,today’schild
"SubstanceAbuse"—SevereAnxietytoSocietyTechnically,anysubstanceotherthanfoodthataltersourbodilyor【W1】________
随机试题
A.基础培养基B.营养培养基C.鉴别培养基D.选择培养基E.厌氧培养基SS琼脂属于()
糖尿病治疗措施中最基本的是
阳水之风水相搏证的治法是()
下列选项中可以成立的是()。
FOBStowed
以下指标的评价标准中,在一般情况下属于越高越好的是()。
下列对货币市场表述正确的有()。
每个人的德性都与公共生活紧密相关,现代国家中的公民,是构成社会的基本分子,离不开公共生活。公共生活的重要部分之一,就是完全超越利己动机的公益慈善。事实上,追问人的本性,每个社会成员都有向善、为善的一面。与其说这是完成他的社会责任,不如说这会给他带来助人的喜
设随机变量X和Y的方差存在且不等于0,则D(X+Y)=DX+DY是X和Y()。
RunningfortheofficeofthePresidentoftheUnitedStatesisexceptionallyarduousandshouldnotbeundertakenbythe【C1】___
最新回复
(
0
)