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
Both plants and animals of many sorts show remarkable changes in form, structure, growth habits, and even mode of reproduction i
Both plants and animals of many sorts show remarkable changes in form, structure, growth habits, and even mode of reproduction i
admin
2011-04-26
90
问题
Both plants and animals of many sorts show remarkable changes in form, structure, growth habits, and even mode of reproduction in becoming adapted to different climatic environment, types of food supply, or mode of living. This divergence in response to evolution is commonly expressed by altering the form and function of some part or parts of the organism, the original identity of which is clearly discernible. For example, the creeping foot of the snail is seen in related marine preemptors to be modified into a flapping organ useful for swimming, and is changed into prehensile arms that bear sartorial disks in the squids and other cephalopods. The limbs of various mammals are modified according to several different modes of life—for swift running (cursorial) as in the horse and antelope, for swinging to several different modes of life—for swinging in trees (arboreal) as in the monkey, for digging ( fossorial ) as in the moles and gophers, for flying (volant) as in the bats, for swimming (aquatic) as in the seals, whales and dolphins, and for other adaptations. The structures or organs that show main change in connection with this adaptive divergence are commonly identified readily as homologous, in spite of great alterations. Thus, the fingers and wrist bones of a bat and whale, for instance, have virtually nothing in common except that they are definitely equivalent elements of the mammalian limb.
Plants and animals change in form ______.
选项
A、as they evolve
B、to adjust to environment
C、because of their structure
D、because of their mode of reproduction
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/B66O777K
0
考博英语
相关试题推荐
Readtheintroductionbelowaboutacompanytrainingprogramme.Choosethecorrectwordtofilleachgap,fromA,BorContheo
LookattheBuildingDirectorybelow.ForQuestions6—10,decidewhichflooreachpersonshouldgoto.Foreachquestion,mark
OfficeStaffRequiredExperienceessentialFulltraininggiven(leadingtorecognisedqualifications)Applicantsmusthave_____
ReadthefollowingreviewsofabookcalledTheBossesSpeak.Foreachquestion23-28,choosethecorrectanswer.Markl
Manypuremetalshavelittleusebecausetheyaretoosoft,rusttooeasily,orhavesomeother______.
WhenIwasakid,Ineverknewwhatmyparents—oranyoneelse’s—didforaliving.AsfarasIcouldtell,allgrownupshadm
正如香港一位银行家所说:“银行,无论是国有或私营,在政客们眼中它都是国家这个大公司的子公司。”
ThepsychologistEdwinG.Boringpreferred"currentofbelief"astheEnglishexpressionfortheGermanwordZeitgeist,usedby
随机试题
设{an}为有界数列,记=sup{an,an+1,…},=inf{an,an+1,…}.证明:对任何正整数n,;
大气环境影响评价工作等级为二级的项目使用AERMOD预测模式不需输入的资料有()。
下列关于保险产品的论述正确的是()。
某学生上课走神,突然被叫起来回答问题,这时他的情绪状态是()。
1,2,5,12,29,()
简述职务侵占罪的构成要件。
中华人民共和国成立初期,建立社会主义国营经济的主要途径是
【S1】【S4】
Wearetoldthatthemassmediaarethegreatestorgansforenlightenmentthattheworldhasyetseen;thatinBritain,forinst
Theownerandeditorofthenewspaper______theconference.
最新回复
(
0
)