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
41
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、They eat or destroy plants.
B、They provide plants with continued oxygen supply.
C、Their manure is eaten by plants.
D、Their manure improves the quality of soil which plants live on.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3588965.html
相关试题推荐
[originaltext]Thediamondisconsideredthemostfamous,elegantandvaluab
[originaltext]Thediamondisconsideredthemostfamous,elegantandvaluab
[originaltext]Thediamondisconsideredthemostfamous,elegantandvaluab
[originaltext]Theearthisgettingwarmer.Peopleburncoal,oilandgasan
[originaltext]Inrecentyears,therehasbeenanunusuallylargenumberof
[originaltext]Inrecentyears,therehasbeenanunusuallylargenumberof
[originaltext]Inrecentyears,therehasbeenanunusuallylargenumberof
[originaltext]W:Frank,what’syourimpressionofEnglishpeople?M:Well,they
[originaltext]W:Hi,John!M:Oh.Hi,Laura.What’reyoudoinghere?W:Uh...
Thesculpture______(象征这位艺术家对动物的爱心).symbolizestheartist’sloveofanimals
随机试题
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikew
WhytheSuper-RichAren’tLeavingMuchofTheirFortunestoTheirKidsA
一项病例对照研究,400名病例中有暴露史者200例,而400名对照中有暴露史者1
吹拉弹唱属于()。A.识记技能 B.心智技能 C.操作技能 D.认知
(2019年真题)境内IPO市场包括() Ⅰ.主板 Ⅱ.中小企业板
对股票投资价值产生影响的宏观经济因素包括()。 ①企业战略 ②货币政策
Rivalta试验是A.葡萄糖定性试验B.黏蛋白定性试验C.氯化物定量试验D.L
保险合同当事人的任何一方违反最大诚信原则,另一方()。 A.把责任转给第三者
细管OB以角速度ω,角加速度α绕O轴转动,一小球A在管内以相对速度
“巴塞尔协议Ⅲ”对商业银行的一级资本充足率下限要求上调至()。A.6% B.
最新回复
(
0
)