首页
登录
职称英语
Scientists have long speculated as to the extent that inbreeding cont
Scientists have long speculated as to the extent that inbreeding cont
游客
2024-01-11
27
管理
问题
Scientists have long speculated as to the extent that inbreeding contributes
to the decline and eventual extinction of large assimilated populations, most
agreeing that in natural populations the impact of inbreeding depression on
Line population survival is insignificant in comparison to that of demographic and
(5) environmental variables. While there is ample evidence of fitness reduction due
to inbreeding depression in captivity, no field studies on natural populations
have been conducted to test the proposed effect on extinction.
However, Saccheri recently found in his study of a large metapopulation of
the Glanville .fritillary butterfly that extinction risk increased significantly
(10) with decreasing heterozygosity, an indication of inbreeding, even after
accounting for the effects of the relevant ecological factors. Rate of maturation,
larval survival, adult longevity and egg-hatching rate were found to be adversely
affected by inbreeding, and appear to be the fitness components underlying the
relationship between inbreeding and extinction. One wonders, nevertheless,
(15) how applicable these results would be to the increasing number of species with
small isolated populations due to habitat loss and fragmentation. [br] Which of the following best describes the organization of the passage?
选项
A、A common viewpoint is presented, its insufficiency is pointed out and a solution is suggested but qualified.
B、A thesis is presented, and a scientific study is cited in support, then criticized.
C、A question is articulated, two possible solutions are offered, then one is decided upon.
D、A scientific study is explained, its results questioned, and a new thesis is formed.
E、A thesis is articulated, then a scientific study is explained which leads to a new thesis.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352657.html
相关试题推荐
ScientistsAhavelongBstrugglewithhowtomeasuretheCeffectsofclimatechan
Untilrecently,scientistsdidnotknowofacloseverte-brateanaloguetothe
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Untilrecently,scientistsdidnotknowofaclosevertebrateanaloguetoth
Scientistsattemptingtoreplicatecertaincontroversialresultsreportedbyag
PopularcultureintheUnitedStateshasbecomeEuropeanizedtoanextentunimag
Scientistsnowbelievethatartificial-hipimplants,previouslythoughttobesa
Becausedinosaurswerereptiles,scientistsonceassumedthat,likeallreptiles
Scientistshavefoundthatinsertinggenesfromaplantvirusintothegenesof
随机试题
因此,当父母移居同外后,母语往往鲜少被提起,甚至慢慢被遗忘。(wither)Solanguagesoftenwitheranddiewhenpar
Whenapplyingforajob,youhaveto______aresume.A、getoffB、takeawayC、put
[originaltext]Mostantsarehardworkersandoftenworkfromsixo’clockin
[originaltext]WinningrecognitionintheannualMichelinGuideisoneofth
Sky-highgasolinepricesaren’tjustraisingthecostofEugeneMarino’s120
我国采取的不动产登记资料信息模式是( )。A.完全公开 B.有限公开 C.
(注:顺差是指在国际收支上,一定时期内收入大于支出的差额;逆差指的是在国
按规定,一般情况下各类债券的交易流通终止日为债券兑付日前的第()个工作日。
目前,国家收回建设用地使用权的原因可能是()。A.建设用地使用权期间届满而
当专项风险等级为()级且无法降低时,必须提高现场防护标准,并视情况开展第三方施
最新回复
(
0
)