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  ___________________________