首页
登录
职称英语
The disappearance of Steller’s sea cow from the Bering and Copper islands by
The disappearance of Steller’s sea cow from the Bering and Copper islands by
游客
2024-01-10
55
管理
问题
The disappearance of Steller’s sea cow from the Bering and Copper islands by 1768 has long been blamed on intensive hunting. But its disappearance took only 28 years from the time Steller first described the species, a remarkably short time for hunting alone to depopulate the islands, especially given the large populations initially reported. However, by 1750, hunters had also targeted nearby sea otter populations. Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins’ grazing pressure on kelp forests to increase. Sea cows were totally dependent on kelp for food, and within a decade of the onset of otter hunting, Steller noted that the islands’ sea cows appeared malnourished. [br] Which of the following can be inferred from the passage about kelp forests in the Bering and Copper islands between 1750 and 1768?
选项
A、They were reduced significantly.
B、They disappeared entirely from the region.
C、They were the primary food source for sea otters.
D、They were harvested in record numbers by humans
E、They increased pressure on sea urchin populations.
答案
A
解析
根据原文,海藻数量在1750—1768年之间因为海胆的数量上升而减少了,因此选项A正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3349594.html
相关试题推荐
Asapracticalmatter,thecopperavailableforindustrialuseshouldnotbetho
InuitsoftheBeringSeawereinisolationfromcontactwithEuropeanslongerth
ThethousandsofvolcanicislandsandcoralatollsoftheSouthSeashaveatota
Oncenumberinginthemillionsworldwide,itisestimatedthatthewolfhasdecl
ArcticdeerliveonislandsinCanada’sarcticregions.Theysearchforfoodby
SPICE:FLAVOR::A、splint:limbB、block:vimC、copper:alloyD、symmetry:balanceE、mo
COPPER:METAL::A、shale:gasolineB、iceberg:mountainC、coal:mineD、segment
SPICE:FLAVOR::A、splint:limbB、block:vimC、copper:alloyD、symmetry:balanc
"Hawaii"refersbothtothegroupofislandsknownastheHawaiianislandsandt
ThedisappearanceofSteller’sseacowfromtheBeringandCopperislandsby
随机试题
Owningamobilephonedefinitelymakeslifemoreconvenient,butyou’dbetterli
Thepriceofwheatissettinganall-timehighintheUnitedKingdom.Food【C
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesand
[originaltext] (5)TheauthoritiesintheAustralianstateofNewSouthWales
对于防病毒系统的测试是系统安全测试的重要内容,下列不属于防病毒系统安全测试基本测
积聚的基本病机是:A.肝络失和 B.湿邪壅阻中焦 C.气机阻滞,瘀血内结
关于基坑支护施工的说法,错误的是()。A、土方开挖的顺序、方法必须与设计工况相一
影响房地产价格的心理因素主要包括()。A.购买或出售心态 B.个人偏好
关于羊水栓塞产妇产科处理原则的陈述中,正确的是A.在第一产程发病者应鼓励其试产
建筑意外伤害保险期限应()。A.从施工工程项目被批准正式开工,并且投保人已
最新回复
(
0
)