首页
登录
职称英语
Both plants and animals of many sorts show remarkable changes in form, struc
Both plants and animals of many sorts show remarkable changes in form, struc
游客
2025-05-06
37
管理
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. [br] 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://tihaiku.com/zcyy/4064554.html
相关试题推荐
Adog’smost______senseisthatofsmell.A、remarkableB、enviableC、noticeableD
Everhearofthelemming?Lemmingsarearcticrat-likeanimalswithveryodd
Everhearofthelemming?Lemmingsarearcticrat-likeanimalswithveryodd
Achild’s______oftenchangesinthepresenceofstrangers.A、personalityB、behav
Therearestrictlawsaboutexporting______animals.A、aliveB、livingC、livelyD、
Humanfacialexpressionsdifferfromthoseofanimalsinthedegreetowhichthe
Beingabletomovegivesanimalsmanyadvantages,butitalsogeneratesitsown
Bothplantsandanimalsofmanysortsshowremarkablechangesinform,struc
Inthepastfewdecades,remarkablefindingshavebeenmadeinethology,the
Inthepastfewdecades,remarkablefindingshavebeenmadeinethology,the
随机试题
(1)TheYouTubevideostartswiththeroadsign:Croxteth,CityofLiverpool.
Whenmedal-winningathletesreturnhomefromtheOlympicGames,theirfa
某双代号网络计划如下图所示则c工作的自由时差为()。 A.0 B.2
曲线y=xsinx+2cosx(-π/2<x<2π)的拐点是( )。A.(0
Ⅰ型高脂血症是指空腹血浆( )。A.CM升高 B.VLDL升高 C.CM和
护士甲与护士乙在同一病房工作,性格完全不一样,护际关系紧张的原因()A.心
倒闸操作应严格执行监护操作制度。监护操作时,操作人在操作过程中不准有任何未经监护
概述宋辽间的战与和,评价宋辽盟约。(40分)
The__________thatBrightStarPrintoff
持有成本理论的基本假设主要有( )。A.借贷利率相同且维持不变 B.无税收和
最新回复
(
0
)