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从生活环境来分,环节动物主要可分为陆生蠕虫、淡水水生蠕虫和海水水生蠕虫。陆生蠕虫以蚯蚓为代表,淡水水生蠕虫以水丝蚓为代表,海水水生蠕虫则以沙蚕为代表。本片分别介绍了这三种环节动物的结构和行为特征,并比较它们的异同,以此描述了环节动物的总体特征。