首页
登录
职称英语
Determining whether a given population of animals constitutes a distinct species
Determining whether a given population of animals constitutes a distinct species
游客
2024-01-12
8
管理
问题
Determining whether a given population of animals constitutes a distinct species can be difficult because no single accepted definition of the term exists. One approach, called the biological species concept, bases the definition on reproductive compatibility. According to this view, a species is a group of animals that can mate with one another to produce fertile offspring but cannot mate successfully with members of a different group. Yet this idea can be too restrictive. First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature. Second, sometimes the differences between two populations might not prevent them from interbreeding, even though they are dissimilar in traits unrelated to reproduction; some biologists question whether such disparate groups should be considered a single species. A third problem with the biological species concept is that investigators cannot always determine whether two groups that live in different places are capable of interbreeding.
When the biological species concept is difficult to apply, some investigators use phenotype, an organism’s observable characteristics, instead. Two groups that have evolved separately are likely to display measurable differences in many of their traits, such as skull size or width of teeth. If the distribution of measurements from one group does not overlap with those of another, the two groups might reasonably be considered distinct species. [br] Which of the following best describes the function of lines 10-13?
选项
A、It elaborates the definition of the biological species concept given in a previous sentence.
B、It develops a point about the biological species concept made in the previous sentence.
C、It states the author’s central point about the biological species concept.
D、It identifies a central assumption underlying the biological species concept.
E、It demonstrates why the biological species concept is invalid.
答案
B
解析
Evaluation
The sentence in question discusses hybridization as a first factor complicating the applicability of the biological species concept. Thus its function is to help explain why, as the previous sentence states, that concept is too restrictive.
A The sentence in question brings up a problem with the biological species concept; it does not elaborate the definition of that concept.
B Correct. According to the sentence that precedes the sentence in question, the biological species concept can be too restrictive. The author offers three reasons to develop this point, and the first reason is given in the sentence in question.
C The sentence in question could be said to support the author’s central point about the biological species concept—that it is one (flawed) way of determining whether a population is a species—but it does not state that central point.
D The sentence in question expresses a problem with the biological species concept, not a central assumption of it.
E The sentence in question serves to indicate a problem with the biological species concept, but it does not go so far as to demonstrate that it is invalid.
The correct answer is B.
转载请注明原文地址:https://tihaiku.com/zcyy/3357272.html
相关试题推荐
Shanghaiis______biggestcityin______Chinaintermsofpopulation.A、the;the
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavorite
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavorite
Itseemslikeeverydaythere’ssomenewresearchaboutwhetherourfavorite
Fiftyyearsago,wealthypeoplelikedhuntingwildanimalsforfun______sightse
人口老龄化已经成为全世界的普遍现象。Populationageinghasbecomeaworld-widecommonphenomenon.
Greenseaturtles(海龟)aretheworld’slargestspeciesofhard-shelledseat
Greenseaturtles(海龟)aretheworld’slargestspeciesofhard-shelledseat
Greenseaturtles(海龟)aretheworld’slargestspeciesofhard-shelledseat
Greenseaturtles(海龟)aretheworld’slargestspeciesofhard-shelledseat
随机试题
Themanagersummonsallthestaffatonce,forthereis________________(很重要的议题要
电压源、电流源的特性可以用电阻来衡量。
某开发区一工程项目因施工升降机制动器长时间维护不到位,制动失效,导致吊笼事故,4
建设工程项目施工评标步骤主要包括( )。A、评标准备 B、资格预审 C、初
歌德生活丰富,他对人生的认识,都是从他新鲜活泼之生活中体验出来的。在他《谈话录》
A第一组图形中,图一沿着对角线折叠后得到图二,第二沿着中线对折,得到图三;第二组图形同样遵循此规律,故答案为A。
下列属于单件小批量生产企业的期量标准的有()。A.生产周期 B.生产提前期
委托代理人为被代理人的利益需要转托他人代理的,通常情况下可以不告诉被代理人自行
()属于银行业自律规范。A.《银行业从业人员职业操守》 B.《银行业协会工
下列情形中,导致建设工程施工合同无效的是( )。A.工程款支付条款订立时显失公平
最新回复
(
0
)