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
2023-08-31
61
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:http://tihaiku.com/zcyy/2972699.html
相关试题推荐
[originaltext]W:Thankheavens!You’rebacksafeandsound.Everyonewasworrie
[originaltext]W:Thankheavens!You’rebacksafeandsound.Everyonewasworrie
[originaltext](32)Theworld’sfirstcompletelyautomaticrailwayhasbeenb
[originaltext](32)Theworld’sfirstcompletelyautomaticrailwayhasbeenb
[originaltext]Investmentinthepublicsector,suchaselectricity,irrigat
[originaltext]Hollywoodproducesmanydifferentkindsoffilms,includingm
[originaltext]M:Itseemsthatalmosteverycitynowhasitsownfilmfestival.
Forthispart,youareallowed30minutestowriteashortessayentitledLiving
[originaltext](32)Howmenfirstlearnttoinventwordsisunknown,inoth
[originaltext](32)Howmenfirstlearnttoinventwordsisunknown,inoth
随机试题
CrossingWesleyanUniversity’scampususuallyrequireswalkingovercolorful
AccordingtoKellyGrant,giftwithpurchaseisacceptableonlywhen______.[br]
[originaltext]M:Today,asourguestonStudentRadioWestmarkisstudentorgan
下列与现金业务有关的职责可以不分离的是()。A.现金支付的审批与执行
以下治理通货膨胀的措施中,属于紧缩性财政政策的是()。A.减少赋税 B.
一次运动会上,赛前报名准备参加的男女运动员的人数之比为23:12。实际比赛时,有
期货公司申请设立分支机构,应当未因涉嫌违法违规经营正在被有权机关调查,近()内
正常排污工况下,采用河流一维稳态水质模型预测入河点源允许排放量,需要使用的条件有
夏季进行水泥砂浆面层抹压施工后,通常不宜直接养护,正确的养护间隔时间应为()
肾小管对H+分泌增加不引起A:Na+吸收增加 B:重吸收增加 C:NH3分泌
最新回复
(
0
)