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“节家家雨，青草池塘处处蛙”．春末夏初，青蛙“呱呱呱”的叫声此起彼伏，寻声找去，你会发现池塘中的青蛙正在抱对，不久，如果你再来，会在水中看到许多小蝌蚪．如果你继续观察下去，还会看到青蛙那魔术般外形变化的全过程．你知道原因吗？动动脑，回答下列问题： （1）雄蛙的鸣叫是为了______． （2）雌雄蛙抱对有什么意义？______． （3）小蝌蚪长得不像“妈妈”，而像是一条小鱼，猜猜看，小蝌蚪在水中是怎样呼吸的？______． （4）仔细观察，你会发现青蛙的发育过程，大体经历了______四个阶段． （5）青蛙和棉铃虫的发育过程有一个共同的突出特征：______． （6）人们称青蛙为“田园卫士”，是因为：______．
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