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
31
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
Infactthepurchasingpowerofasingleperson’spensioninHongKongwasonly
ImprovingYourMotivationforLearningEnglishI.Theim
医生赵某,在门诊值班时发现一患有霍乱病人,但未予以隔离治疗,经诊治后让患者回家,
孕妇分娩过程中,出现不协调性子宫收缩乏力,正确的处理是A、肌注哌替啶(杜冷丁)
2013年单项选择:丁力有意识地对自己的学习活动进行检查与监控。他所运用的学习策
某计算机网络技术有限公司拟招聘5名客户经理,主要负责公司网络产品的市场推广和客户
A.mg B. C. D.
当运用不同种类的K线组合得到的结论不同时,应尽量使用根数多的K线的结论。()
企业持有的中国铁路建设债券取得的利息收入免征企业所得税。()
在施工过程中,承包商遇到了“一个有经验的承包商无法合理预见的“地质条件变化,则承
最新回复
(
0
)