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
20
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
Thepowerofwords,thenliesintheirconnections—thethingstheybringupbefo
Conventionalwisdomhasitthatmalebirdsareloyalandfaithfulbecauseth
BuildYourSelf-confidence1.【T1】______fear【T1】______
[originaltext]AnewstudyintheUnitedStatessaysmentaldisordersappear
[originaltext]AsmalldogbroughtdisastertoasmallEnglishtownlastwee
A.等前方道路疏通后,且信号灯为绿灯时方可继续行驶 B.等有其他机动车进入路口
郁李仁入汤剂的煎法是A:包煎B:后下C:先煎D:打碎入煎E:另煎
某男,25岁。因腹泻就诊。症见腹痛肠鸣,泻下粪便臭如败卵,伴有未消化食物,泻后痛
不属于卫生行政部门对医疗机构诊疗活动超出登记范围的处罚A.没收非法所得 B.警
代谢性酸中毒病人一般不表现为( )。A.面部潮红 B.心率加快 C.呼吸深
最新回复
(
0
)