首页
登录
职称英语
[originaltext] No living creature, plant or animal, can exist in complete is
[originaltext] No living creature, plant or animal, can exist in complete is
游客
2024-05-08
46
管理
问题
No living creature, plant or animal, can exist in complete isolation. An animal is bound to depend on other living creatures, ultimately plants, for its food supply; it must also depend upon the activities of plants for a continued oxygen supply for its respiration. Apart from these two basic relationships, it may be affected directly or indirectly in countless different ways by other plants and animals around it. Other animals prey on it or compete with it for the same food; plants may provide shelter, concealment or nesting material, and so on. Similarly, the animal will produce its own effects on the surrounding plants and animals: some it may cat or destroy, for others it will provide food; and through its contribution of manure it may influence the texture and fertility of the soil.
This dependence on other living things is not confined to animals. Though plants manufacture their own food, they are dependent on animal respiration for at least a part of the carbon dioxide which they use as raw material in this process. Moreover, despite the apparently peaceful relationships in plant communities, there is intense competition going on for water, nutrient salts, and above all, for light.
The whole complex of the plants and animals forming a community, together with all the interaction physical factors of the environment, really forms a single unit, which has been called an ecosystem. It will be seen that the final aim of ecology -- the complete understanding of ecosystems -- is an ideal one we can scarcely hope to attain. It is nevertheless an ideal well worth pursuing and valuable progress has been made towards it.
选项
A、A community of plants.
B、A community of animals.
C、The study and understanding of plants and animals.
D、The interacting physical factors of the environment.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3588966.html
相关试题推荐
【B1】[br]【B11】[originaltext]Tobesuccessfulinajobinterview,youshould
【B1】[br]【B9】[originaltext]Tobesuccessfulinajobinterview,youshould
【B1】[br]【B6】[originaltext]Tobesuccessfulinajobinterview,youshould
【B1】[br]【B3】[originaltext]Tobesuccessfulinajobinterview,youshould
[originaltext]AlotofpeoplearefamiliarwiththestoryofBraveGelert,
[originaltext]Somethinghappenedinthe1970’s:thepriceofoilincreased
[originaltext]Inmanycountriesthestandardoflivingenjoyedbytheirpeo
[originaltext]Inmanycountriesthestandardoflivingenjoyedbytheirpeo
[originaltext]M:Hello.W:Hello,Sam.ThisisPaulaHandson.Sorrytobothery
[originaltext]M:Hello.W:Hello,Sam.ThisisPaulaHandson.Sorrytobothery
随机试题
【B1】[br]【B9】pop∧on→up本题考查词语使用。pop一词虽然为不及物动词,指“突然出现”,但是必须要加副词或者介词短语使用,在显示器上出现
Neverbeforethatnight______theextentofhisownpower.A、hadhefeltB、hefe
Meilingreturnedfromabroadatotallydifferentperson.Theitalicizedpartfun
儿童鞍区最常见的肿瘤是A、畸胎瘤 B、胆脂瘤 C、颅咽管瘤 D、垂体瘤
视唱下面的旋律,选择出相应的曲目名称() A.《在希望的田野上》 B.《
“奢糜之始,危亡之渐”这句话蕴涵的哲理是()。 A.现象是本质的外部表现
某投资者购买了一总价为300万元的店铺用于经营,其经营资金为20万元,权益资本为
企业收到政府无偿划拨的公允价值不能可靠取得的非货币性长期资产,应当按照名义金额(
下列各项操作,会使工作表整体向右水平移动的有( )。A.向左拖动水平滚动条
下列选项中,不符合《关于加强建筑意外伤害保险工作的指导意见》要求的是()A.建筑
最新回复
(
0
)