热带雨林中的植被大都分层次分布,高大的乔木下是低矮的灌木,灌

热带雨林中的植被大都分层次分布,高大的乔木下是低矮的灌木,灌木下是一些草本植物。形成这种层次分布的主导生态因素是(    

A.温度      B.水分       C.光照       D.空气

答案

C

相关题目

只用一种试剂就可鉴别NaCl、NH4Cl、Na2CO3三种溶液,该试剂是
只用一种试剂就可鉴别NaCl、NH4Cl、Na2CO3三种溶液,该试剂是(   ) A.KCl溶液   B.Ba(OH)2  溶液C.NaOH溶液  D.NaNO3溶液
We have ________ time to relax because we have much work to do every day. A.
We have ________ time to relax because we have much work to do every day. A.less and less                                               B.more and m
Schools across China are expected to hire 50,000 college graduates this year as
Schools across China are expected to hire 50,000 college graduates this year as short-term teachers        increase job opportunities.        A.help  B.to have helped  C.to help 
下列说法错误的一组是(    ) ①不溶于水的BaSO4 是强电
下列说法错误的一组是(    ) ①不溶于水的BaSO4 是强电解质  ②可溶于水的酸都是强电解质  ③0.5mol/L的所有一元酸中氢离子浓度都是0.5mol/L  ④熔
将下面句子的内容改用平实、概括的文字表达出来。(不超
将下面句子的内容改用平实、概括的文字表达出来。(不超过15个字。4分)     如天界魔术师诡谲的表演,北极光一会儿射出幽幽的绿光,一会儿闪着
She raised her finger to her lips as _____ for silence. A. an idea      
She raised her finger to her lips as _____ for silence. A. an idea       B. a mark C. a sign  D. a word
在t℃时,AgBr在水中的沉淀溶解平衡曲线如图所示。又知t℃
在t℃时,AgBr在水中的沉淀溶解平衡曲线如图所示。又知t℃时AgCl的Ksp=4×10-10,下列说法不正确的是(   ) A.在t℃时,AgBr的Ksp为4.9×10-13    B.
新生儿小肠上皮细胞通过消耗ATP,可以直接吸收母乳中免疫
新生儿小肠上皮细胞通过消耗ATP,可以直接吸收母乳中免疫球蛋白、半乳糖和葡萄糖等。母乳中的营养蛋白可以被消化吸收。免疫球蛋白在新生儿消化

最新题目