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bei lei de yu di fang shi zhi duo shao ?
Author(s): 
Pages: 14
Year: Issue:  4
Journal: Ocean World

Keyword:  贝类泥沙头足类节肢动物软体动物御敌快速运动紧张状态外套膜活动能力;
Abstract: <正> 贝类动物约有11万多种,是动物界中第二大门类,仅次于节肢动物。它们因身体柔软被称为软体动物,又因多具贝壳而被称为贝类。除头足类等少数种类外,贝类的活动能力都相当微弱,难以快速运动来逃避敌害。那么它们是如何御敌的呢?下面的几种方式,便是贝类保护自身的鲜招。喷墨:除鹦鹉贝、须蛸和章鱼外,头足类体内通常都有墨囊,内具墨腺,遇敌时可放墨御敌。如乌贼遇敌时,首先处于紧张状态,周
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