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
34
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] According to the passage, it is likely that during the mid-1700s, sea urchin populations near the Bering and Copper islands
选项
A、were diminished by sea cow predation
B、experienced substantial increases
C、migrated to waters with more plentiful food supplies
D、were reduced by the pressures of hunting
E、appeared to be malnourished
答案
B
解析
根据文章,1700年代中期海胆的数量因为海獭数量锐减而增多,选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3349595.html
相关试题推荐
Lessthan400SumatranrhinossurviveontheMalaypeninsulaandontheislands
ThethousandsofvolcanicislandsandcoralatollsoftheSouthSeashaveatota
Oncenumberinginthemillionsworldwide,itisestimatedthatthewolfhasdecl
ArcticdeerliveonislandsinCanada’sarcticregions.Theysearchforfoodby
SPICE:FLAVOR::A、splint:limbB、block:vimC、copper:alloyD、symmetry:balanceE、mo
COPPER:METAL::A、garnet:mineralB、granite:plantC、nucleus:cellD、iron:c
Sinceotherseabirdscustomarilynestincoloniesonoceancliffsandislands,t
"Hawaii"refersbothtothegroupofislandsknownastheHawaiianislandsandt
Biologists(i)____isolatedoceanicislandsliketheGalapagos,because,insuch
ThedisappearanceofSteller’sseacowfromtheBeringandCopperislandsby
随机试题
TowhomdidMs.Tonakatellaboutheridea?[br][originaltext]JapaneseFore
TheEuropeanUnionhadapprovedanumberofgeneticallymodifiedcropsuntil
Americanshavelonger,butnotnecessarilyhealthierlivesduetohighrates
不属于病人的权利是A.保管病志权 B.知情同意权 C.平等医疗权 D.自由
A.经行感冒 B.经行头痛 C.经行身痛 D.带下病 E.经间期出血以上
房地产经纪机构以( )为主要资源。A.人力 B.财力 C.信息 D.关系
A.噬菌体B.毒力变异C.基因重组D.细菌素E.芽孢属于细菌的遗传物质
(2015年真题)阿卡波糖片的适宜服药时间是( )。A.清晨 B.餐前 C
下面有关土壤卫生标准的说法中,不正确的是A.我国土壤中铜的卫生标准是150mg/
关于原发性肺结核下列哪项是正确的A、常见的死因是结核性脑膜炎 B、主要经支气管
最新回复
(
0
)