首页
登录
职称英语
The eight chipmunk species of the Sierra Nevada represent but a few of the 1
The eight chipmunk species of the Sierra Nevada represent but a few of the 1
游客
2025-02-06
26
管理
问题
The eight chipmunk species of the Sierra Nevada represent but a few of the 15 species found in western North America, yet the whole of eastern North America makes do with but one species: the Eastern chipmunk. Why are there so many very similar chipmunks in the West? The presence of tall mountains
interspersed with
vast areas of arid desert and grassland makes the West ecologically far different from the East. The West affords much more opportunity for chipmunk populations to become geographically isolated from one another, a condition of species formation. Also, there are more extremes in western habitats. In the Sierra Nevada, high elevations are close to low elevations, at least in terms of mileage, but ecologically they are very different. [br] In paragraph 2, the author indicates that a large variety of chipmunk species exist in western North America because of
选项
A、a large migration of chipmunks from eastern North America in an earlier period
B、the inability of chipmunks to adapt to the high mountainous regions of eastern North America
C、the ecological variety and extremes of the West that caused chipmunks to become geographically isolated
D、the absence of large human populations that discouraged species formation among chipmunks in the East
答案
C
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3944705.html
相关试题推荐
Themostaggressiveofthefoureastern-slopespeciesisthelodgepolechipm
Theanswer,inoneword,isaggression.Chipmunkspeciesactivelydefendthe
Ecologistshavestudiedthefourchipmunkspeciesthatoccurontheeastern
Mostecologistsbelievethatancientpopulationsofchipmunksdivergedgenet
TheeightchipmunkspeciesoftheSierraNevadarepresentbutafewofthe1
"ExoticandEndangeredSpecies"Whenyouhearsomeonebubblingenthusiastical
"ExoticandEndangeredSpecies"Whenyouhearsomeonebubblingenthusiastical
"ExoticandEndangeredSpecies"Whenyouhearsomeonebubblingenthusiastical
"ExoticandEndangeredSpecies"Whenyouhearsomeonebubblingenthusiastical
"ExoticandEndangeredSpecies"Whenyouhearsomeonebubblingenthusiastical
随机试题
"Iwouldtellanyonewho’sthinkingaboutgoingbacktoschoolthatit’s
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangive
NoticeOverthepastmonththePersonnelOffice
It’sHardtoCleanBigDataA)KarimKeshayjee,aTorontophy
Organicfarmershadfoughttopreventgenetically-engineeredcropsfrombein
(2017年)下列关于关税税率适用的说法中,正确的是( )。A.征收报复性关税的
目前,我国商业银行的资本充足率是以( )为基础计算的。A.会计资本 B.经济
《中华人民共和国民法典》第一百八十八条规定,向人民法院请求保护民事权利的诉讼时效
王某向刘某借款30万元,约定还款期限为2012年3月3日,在借条的背面写尽“担
县级以上地方人民政府消防救援机构应当将发生火灾可能性较大以及发生火灾可能造成重大
最新回复
(
0
)