首页
登录
职称英语
Historically, more cold-adapted antelope species originating in Eurasia have
Historically, more cold-adapted antelope species originating in Eurasia have
游客
2024-01-10
59
管理
问题
Historically, more cold-adapted antelope species originating in Eurasia have migrated into Africa, where the climate is generally warmer, than have warm-adapted African species into Eurasia. A likely explanation for this involves the fact that intercontinental migrations require both a land bridge connecting the two continents and the suitable habitat both on and across that land bridge. During periods of climatic cooling, such as the various ice ages, the land bridge is open for a long time (because sea level remains low) and is usable by cold-adapt species because cool habitats then extend across it. Thus during cooling most migrants would be expected to travel toward Africa, which is near the equator, since this is the direction dictated by habitat changes on a cooling Earth. In contrast, when the Earth is warm, the land bridge is reduced or gone because sea level is relatively high then. Only during the short lag between onset of global temperature change and sea level response can warm-adapted species migrate from the equator toward higher latitudes. [br] According to the passage, which of the following best accounts for the apparent bias in antelope-migration direction?
选项
A、Warm-adapted antelope species are rarely able to tolerate cool habitats, whereas cold-adapted antelope species usually can tolerate warm habitats.
B、During global warming periods, land bridges, when present, lack habitats suitable for sustaining warm-adapted antelope species.
C、Under most climatic conditions, Africa offers a larger number of suitable antelope habitats than does Eurasia.
D、Many more species of antelope have originated in Eurasia than have originated in Africa.
E、Land bridges are more likely to exist when climate change favors migration to warmer climates than when climate changes favors migration to cooler climates.
答案
E
解析
“气候变化适合迁徙到温暖环境中时”指的就是全球变暖的时候,根据文章,这个时候大陆桥更可能存在。但是气候变暖时,大陆桥只会存在很短的一段时间,所以选项E正确。A项文章本身没讨论羚羊对于温度的适应性问题,而且决定羚羊往哪个方向迁徙的因素是大陆桥和大陆桥上的栖息地,而非动物的忍耐性。B项当全球变暖时,在short lag期间,大陆桥上依然有合适的栖息地。C项从文中看不出来。D项从文中看不出来。
转载请注明原文地址:https://tihaiku.com/zcyy/3349548.html
相关试题推荐
Thechancesthataspecieswill(i)______arereducedifanyvitalfunctionisr
Specieswithrelatively______metabolicrates,includinghibernators,generally
Ecologistsstudyhowmillionsofspeciessharetheworld,ratherthantakeo
Whatcausessizevariationinbumblebeeworkers?Inpollenstoringspeciesl
DuringthePleistoceneepoch,severalspeciesofelephantsisolatedonislan
Historically,morecold-adaptedantelopespeciesoriginatinginEurasiahave
EarlynaturalistsbelievedtwospeciesofbeaverlivedinNorthAmerica:dam
MigratorysongbirdsbreedinginEurasia’stemperateforestsdependonasumm
MigratorysongbirdsbreedinginEurasia’stemperateforestsdependonasumm
Seedingaforestwithnonnativespeciesafterafirecanimpedenativeplant
随机试题
Manyimportantmistakeshavebeenescaping_____,andalotofmoneyhasbeenlost
Since2007,theAmericanPsychologicalAssociation(APA)hasconductedasurve
【B1】[br]【B11】[audioFiles]audio_eufm_j01_343(200910)[/audioFiles]InterestinC
TheRevolutionaryWar,whichbeganofficiallyonApril19,1775,draggedon
American’sgeniuswithhightechnologymayhaveputmenonthemoon,butthe
下列关于房产税的说法中,正确的是()。A.农村地区自用房产不需要缴纳房产税,
胆红素结晶见于A.肺结核B.肺吸虫病C.肺脓肿D.支气管扩张E.脓胸
下列哪哪项不是造成不孕的原因A.子宫颈松弛B.子宫发育不良C.子宫肌瘤D.子宫内
超过半米长的碳纳米管的问世,使其朝应用方向踏出了重要一步。碳纳米管最重要的应用就
监理工程师编制资金使用计划时,下列分解格式中,属于按投资构成分解投资目标的有()
最新回复
(
0
)