首页
登录
职称英语
Coincident with concerns about the accelerating loss of species and habitats
Coincident with concerns about the accelerating loss of species and habitats
游客
2023-09-11
4
管理
问题
Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity, the number of species in a particular ecosystem, to the health of the Earth and human being. Much has been written about the diversity of terrestrial (陆生的) organisms, particularly the exceptionally rich life associated with tropical rain forest habitats.
Relatively little has been said, however, about diversity of life in the sea even though coral reef systems are comparable to rain forests in terms of richness of life. An alien exploring Earth would probably give priority to the planet’s dominant, most distinctive feature—the ocean. Humans have a bias toward land that sometimes gets in the way of truly examining global issues. Seen from far away, it is easy to realize that landmasses occupy one third of the Earth’s surface. Given that two thirds of the Earth’s surface is water and that marine life lives at all levels of the ocean, the total three dimensional living space of the ocean is perhaps 100 times greater than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species.
The fact that half of the known species are thought to inhabit the world’s rain forests does not seem surprising, considering the huge numbers of insects that comprise the bulk of the species. One scientist found many different species of ants in just one tree from a rain forest. While every species is different from every other species, their genetic makeup constrains them to be insects and to share similar characteristics with 750,000 species of insects. If basic, broad categories such as phyla and classes (门和纲) are given more emphasis than differentiating between species, then the greatest diversity of life is unquestionably in the sea. Nearly every major type of plant and animal has some representation there.
To appreciate fully the diversity and abundance of life in the sea, it helps to think small. Every spoonful of ocean water contains life on the order of 100 to 100, 000 bacterial cells plus assorted microscopic plants and animals, including larvae (幼虫) of organisms ranging from sponges and corals to starfish and clams and much more. [br] The author argues that there is more diversity of life in the sea than in the rain forests because ______.
选项
A、more phyla and classes of life are represented in the sea
B、there are too many insects to make meaningful distinctions
C、many insects species are too small to divide into categories
D、marine life-forms reproduce at a faster rate
答案
A
解析
细节题。第三段最后两句说明如果更重视门和纲,则毫无疑问,海洋中的生物要比热带雨林中的多。
转载请注明原文地址:https://tihaiku.com/zcyy/3004323.html
相关试题推荐
IntheUnitedStates,theneedtoprotectplantandanimalspecieshasbecom
IntheUnitedStates,theneedtoprotectplantandanimalspecieshasbecom
Ifonlymanhadbeenabitlessgreedy,moreanimalspecies______.(或许不会灭绝了)。mig
SomeoftheconcernssurroundingTurkey’sapplicationtojointheEuropeanU
SomeoftheconcernssurroundingTurkey’sapplicationtojointheEuropeanU
Itispossiblethattheviruscanjumpspecies,______(但是没有理由担心它会感染人类).butthe
[originaltext]Mostanimalsusemorethanonespeciesasfood.Therefore,th
Certainspeciesdisappearedorbecameextinct___________________(是由于产生了新物种形式,它们可
Coincidentwithconcernsabouttheacceleratinglossofspeciesandhabitats
Coincidentwithconcernsabouttheacceleratinglossofspeciesandhabitats
随机试题
[originaltext]M:Wegot34onthelistsofar,butI’msureit’llbeupinthe
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywi
2001年9月11日,基地组织策划了对美国纽约世界贸易中心和五角大楼的一系列恐怖
两种砂的细度模数相同,它们的级配也一定相同。()
A.A B.B C.C D.D
原发性糖尿(真性)主要病因是A.胰岛素分泌量相对或绝对不足B.腺垂体功能亢进C.
2009~2012年间一次能源生产量增速最快的一年是:A.2009年
ZH机械制造总厂聘请第三方咨询机构对其生产的XR牌机械产品进行全国满意度调查,
劳动定额法在贯彻实施过程中,包括()等基本环节。A:定额制定 B:定额贯
甲公司为增值税一般纳税人,2018年发生的有关交易性金融资产业务如下: (
最新回复
(
0
)