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蠕形动物是无脊椎动物学中很重要的一章。本章包括动物分类系统中的三个门,一是缺乏体腔的扁形动物,另一是具有假体腔的圆形动物,其次是具有具体腔的环节动物。这样繁杂的分类系统,对初中学生来
Demodex is a very important chapter in invertebrates. This chapter includes three doors in the animal classification system. One is a flat animal that lacks a body cavity. The other is a circular animal with a prosthetic cavity, followed by a link animal with a specific cavity. Such a complicated classification system for junior high school students