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
56
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
Directions:Readthepassage.Thenanswerthequestions.Giveyourself20minute
Anewstudyfoundthatinner-citykidslivinginneighborhoodswithmoregre
以下各项中,不是数据报操作特点的是()。A.每个分组自身携带有足够的信息,它的
外部网关协议BGP是不同自治系统的路由器之间交换路由信息的协议,BGP-4使用四
防止和治疗恒牙早萌的重要环节是A.配戴阻萌器 B.控制局部炎症和感染 C.若
医务人员在确定辅助检查项目后,必须做到A.向病人解释清楚检查的危险性 B.只要
某教学点的张老师根据班级学生人数太少的情况,打破传统课堂讲授惯例,进行讨论式教学
通常在一个国家或地区的金融监管组织机构中居于核心位置是()。A.金融同业自律组
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
背景资料: A安装公司中标承建某生产线设备的安装,双方按规定签订了设备安装承包
最新回复
(
0
)