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
63
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
Whatdoesthemanwantthewomantodo?[br][originaltext]Woman:I’dbehappy
HowtoWriteaDissertationI.TwonecessarypreparationsA
[originaltext]M:IjustreceivedanE-mailfromoneofmyformerclassmates.I
C
某桥梁经过一次特大洪水之后,需对桥梁进行检查,叫做()。A.经常检查 B
下列关于项目职业健康安全过程控制说法错误的是()。A、施工中人的不安全行为、物的
护士在收集患者资料过程中,不正确的是A、所有资料均来自护士与患者的正式与非正式
白矾的中毒症状有A.口腔烧灼 B.呕吐腹泻 C.血压下降 D.尿量减少
隐匿、伪造或者擅自销毁医学文书及有关资料,构成犯罪的?A.责令暂停6个月以上l年
颈椎病主要体征为A.“4”字试验阳性B.伸肌腱牵拉试验(MIills)阳性C.杜
最新回复
(
0
)