试题与答案

用达尔文进化论的观点分析,长颈鹿的形成是由于( ) ①在食物充足的环境中,长颈鹿

题型:选择题

题目:

用达尔文进化论的观点分析,长颈鹿的形成是由于(  )

①在食物充足的环境中,长颈鹿的颈长的长  

②竞争中,颈长者的生存机会大  

③在缺乏食物的环境中,长颈鹿的颈因经常使用而变长  

④经过逐代选择,长颈的变异逐代积累而形成.

A.①②

B.②④

C.②③

D.①④

答案:

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