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
117
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
Therehasbeena_____lackofcommunicationbetweentheunionandthemanagement.
Manypeoplebelievetheglarefromsnowcausessnowblindness.Yet,darkglassesornottheyfindthemselvessufferingfromhead
Overthepasttwodecades,thelivesofAmericanwomenhaveundergoneunparalleledchange.TheVirginiaSlimsOpinionPollhasc
Themostconvincingevidencefortheimportanceofadultinfluenceonachild’sintelligencecomesfromastudyof"atrisk"chil
Ascorchingsun,anendlessseaofsandandawaterless,forbiddinglylonelyland—thatistheimagemostpeoplehaveofdeserts.
TheforeignministerwouldrevealnothingabouthisrecenttouroftheMiddleEastbeyondwhathadalreadybeenannouncedatthe
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessesmay
Thereare______differencesbetweentheoryandpractice.
Whenherealizedhehasbeen______tosignthecontractbyintrigue,hethreatenedtostartlegalproceedingstocanceltheagree
随机试题
患者,女性,30岁,左腰被撞击1小时后就诊。BP120/70mmHg,Hb110g/L,腹部无肌紧张及压痛,左侧腹部触及包块,范围局限,无移动性浊音。可能的诊断为
乳果糖属于
在碱性尿液中弱碱性药物()。
下列关于NPV与IRR,说法正确的是( )。
采用信用证结汇时,银行要求“单证表面严格相符”。但如出现单证不符,出口商可以采用()。
货币供不应求,利率上升;货币供过于求,利率下降。因而适当调节利率水平,就可以直接调节()。
咨询人员在对企业进行业务流程再造活动中,每项建议措施都与客户充分讨论并获得认可,特别关注流程的安全性、经济性和流程中团队作用的挖掘。业务流程再造应遵循的原则有()。
2005年1月9日巴勒斯坦历史上第二次大选落幕,以62.5%的最高得票率顺利当选巴勒斯坦民族权力机构主席的是
AgingposesaseriouschallengetoOECD(OrganizationofEconomicCo-operationandDevelopment)countries,inparticular,howto
A.incomeB.polarizationC.transformationsD.oldE.changesF.worseG.relaxedH.therebyI.divisionJ.accompanying
最新回复
(
0
)