题目内容：

下列现象，各反应了生物的哪一特征？

(1)螳螂捕蝉，黄雀在后  ___________________________ 

(2)鲸喷出雾状水柱  ___________________________         

(3)汗流浃背  ___________________________             

(4)葵花多多向太阳   ___________________________          

(5) 蜻蜓点水   ___________________________              

(6)龙生龙，凤生凤   ___________________________