首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Scientists formerly assumed that coral populations remained stable, dead polyps being replaced by now ones that build on the "sk
Scientists formerly assumed that coral populations remained stable, dead polyps being replaced by now ones that build on the "sk
admin
2017-05-11
79
问题
Scientists formerly assumed that coral populations remained stable, dead polyps being replaced by now ones that build on the "skeletons" left behind. Recent investigations, however, reveal more dynamic processes. Whole sections of a colony may die and not be replaced. This process, known as partial colony mortality, is evident in a series of photographs over time, but often impossible to detect in site because "skeletons" bared by the death of overlying tissue are readily overgrown by other organisms or abraded by grazers. Partial mortality can produce fission the process of a large colony splitting apart into two or more adjacent colonies that presumably have identical genetic makeup. Subsequent lateral growth may unite these colonies in a process called fusion. As a consequence of these three processes, estimates of coral ages based on size are Partial mortality and fission, which reduce colony size, occur more frequently than fusion, and thus estimates of coral age based on colony size are probably far too low.
According to the passage, all of the following are confounding factors in determining the exact age of a coral colony EXCEPT______.
选项
A、the abrading of the colony surface by feeding organisms
B、the balance between polyp births and deaths
C、partial colony death
D、reuniting of colonies after fission
答案
B
解析
排除题。A、C和D文中均有提到。B是科学家们以往的认识,已经被最近的研究发现所否定。故B选项正确。
转载请注明原文地址:https://kaotiyun.com/show/7RFO777K
0
考博英语
相关试题推荐
Theearthiswitnessinganurbanrevolution,aspeopleworldwidecrowdintotownsandcities.In1800onlyfivepercentofthew
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyou
Obviously,theChairman’sremarksattheconferencewere_____andnotplanned.
现在,成千上万的美国人沉湎于对身材苗条的追求之中。他们着迷于节食和锻炼,这不仅仅是因为他们对年轻外表的追求,最近的一项研究表明节食和体育锻炼对身体健康的极端重要性。如同在许多工业技术发达的国家中一样,北美人的生活方式发生了显著的变化。现代化的机器完成了人们
Themostconvincingevidencefortheimportanceofadultinfluenceonachild’sintelligencecomesfromastudyof"atrisk"chil
Themostconvincingevidencefortheimportanceofadultinfluenceonachild’sintelligencecomesfromastudyof"atrisk"chil
Forthepastseveralyears,theSundaynewspapersupplementParadehasfeaturedacolumncalled"AskMarilyn."Peopleareinvite
Thekidsarehangingout.Theyarenotoldenoughforjobs.Noraretheyrichenoughforcamp.Theyareschoolchildrenwithout
Healthyguiltisawarningsignalthateithersomethingdangerousisabouttohappenorsomethinghasalreadyhappenedthatneed
InPlato’sRepublicwefindadiscussionaboutmoralityandselfishness.Plato’sbrotherGlauconistryingtomakeSocratesgive
随机试题
滤线栅是由许多薄的铅条和易透过X线的低密度物质作为充填物,交替排列组成的。在X线摄影中使X线的中心线对准滤线栅板中心,原射线投射方向与滤线栅的铅条排列间隙在同一方向上,能通过铅条间隙而到达胶片产生影像。由于被照体产生的散射线是多中心、多方向,其中大部分散射
55岁女性,阴道不规则出血一年余,分泌物臭,宫颈肥大、重度糜烂、质硬,子宫正常大小,质中,活动,双侧宫旁组织软,阴道穹窿处质硬,弹性差,不平。应采取的治疗是
道路绿地率是指()。
矿井的物理定向方法有()。
在World编辑状态下,可通过Del键将已选中的文本块删除。()
下列关于政府补助的表述中,不正确的是()。
李明倡导低碳出行,每天骑自行车上下班,如果他每小时的车速比原来快3千米,他上班的在途时间只需原来时间的4/5,如果他每小时的车速比原来慢3千米,那么他上班的在途时间就比原来的时间多:
2012年下半年,某市房地产市场一片繁荣。该市居民钱某见状欲将多年经商的积蓄投资于房产,遂四处寻找合适房源。2012年10月5日,钱某从孙某手中以每平方米2万元的价格购得二手房一套。后发现孙某只是该房屋的租户并非该房屋的所有人,但该房屋的所有人阮某对孙某的
下列关于虚拟局域特征的描述中,错误的是()。
为了实现在学生表中查询所有姓“张”的学生记录,对以下SELECT语句中的条件子句进行补充:SELECT*FROM学生表WHERE姓名【】。
最新回复
(
0
)