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
Natural selection describes the biological process in which the differences of individuals within a population influences their
Natural selection describes the biological process in which the differences of individuals within a population influences their
admin
2011-01-06
119
问题
Natural selection describes the biological process in which the differences of individuals within a population influences their abilities to survive and reproduce in an environment. The differences in individuals is a result of their genetic inheritance from their parents. In a population, any characteristic which blocks reproduction success tends to decrease generation by generation. In time, the ill-adapted die out. On the other hand,the individuals who do survive and reproduce will tend to produce offspring which are better adapted to the environment. Natural selection tends to promote adaptations that will increase the organism’s ability to survive in an environment.
Natural selection can serve to stabilize a population if the new traits, called mutations, are eliminated when they appear because they are not as well-adapted to the environment. The opposite effect is obtained when a new trait is introduced which allows individuals to adapt better over time, the species will change as this mutation becomes more widespread in the population. In human beings, increased brain size helped individuals to adapt better, and so brain size increased gradually in the species. Changes in the overall genetic makeup of a population are normal when there are environmental changes, especially sever environmental disruptions. Specialized adaptations to specific environments can lead, over time, to the development of subpopulation of individuals, ones who are better adapted to particular soil conditions food sources and so on. Given enough time, these subpopulations may develop into separate species, such as zebras and horses, living in distinct environments and not interbreeding.
The word "population" in sentence 3 is closest in meaning to which of the following?
选项
A、species
B、people
C、inhabitants
D、set
答案
A
解析
题目询问以下哪个选项与文章第三句中的population的意义最接近。population在别的句中也有出现。population一般是指“人口,居民权,市民”等,而在生物用语中则多半代表“(一定区域的所有)群体集团”。在这里,与A选项speices“种”为相同的意义。
转载请注明原文地址:https://kaotiyun.com/show/gK1d777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
ItiscommonforAmericanstohavedifferent"circlesoffriends"suchaschurchfriends,workfriends,orsportsfriends.【R1】__
ItiscommonforAmericanstohavedifferent"circlesoffriends"suchaschurchfriends,workfriends,orsportsfriends.【R1】__
1.Cellphonesareverycommonamongpeoplenowadays.Theyhavelongbeenmorethanjusttelephones.Theycantakeandsendphot
ThenumberofspeakersofEnglishinShakespeare’stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthat
ItiscommonlybelievedintheUnitedStatesthatschooliswherepeoplegotogetaneducation.Nevertheless,ithasbeensaid
1.Mostyoungpeopleenjoysomeformsofphysicalactivity.Itmaybewalking,cyclingorswimming,orinwinter,skatingorski
1.InancientGreeceathleticfestivalswereveryimportantandhadstrongreligiousassociations.TheOlympianathleticfestiva
1.InancientGreeceathleticfestivalswereveryimportantandhadstrongreligiousassociations.TheOlympianathleticfestiva
Youaregoingtoreadamagazinearticleaboutthepopularityofactivityholidays.Choosethemostsuitableheadingfromtheli
A.toavoidunpleasantthingsinlifeB.inlookingonthebrightsideoflifeC.lesslikelytocatchcoldD.howonelookson
随机试题
上题病例最重要的治疗方法是
甲建筑工程公司总承包建筑工程和转让办公用房应缴纳的营业税为( )。甲建筑工程公司招待所收入应缴纳的营业税为( )。
甲公司系增值税一般纳税人,不动产适用的增值税税率为10%,按净利润的10%提取盈余公积。甲公司采用成本模式对投资性房地产进行后续计量。不考虑其他因素,有关资料如下:资料一:2×18年12月18日甲公司与乙公司签订租赁合同,甲公司将一栋办公楼整体出租给乙公
关于劳动者和用人单位签订劳动合同,违约方要支付违约金这种制度,我认为()。
下列对教学反思的意义,描述不合理的是()。
公安机关对非法种植毒品原植物,非法运输、买卖、存放、使用罂粟壳的,制作、复制、出售、出租或者传播淫秽物品的,可以并处()。
流动资金贷款的偿还方式多为()。
FrictionbetweenAmerica’smilitaryanditscivilianoverseersisnothingnew.America’s220-yearexperimentinciviliancontrol
关系数据规范化是为解决关系数据库中的什么问题而引入的?______A)保证数据的安全性和完整性B)减少数据操作的复杂性C)插入、删除和数据冗余D)提高查询速度
Somepeoplebelievethatyouhavetobeaspecialkindofpersontosellaproduct.Butalthoughitisclearthatasuccessfuls
最新回复
(
0
)