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教材内容分析本节课内容为义教版生物学上册第二单元第四章的教学内容。在生物圈中有单细胞生物和多细胞生物,同时也有一类是没有细胞结构、寄生在活细胞中的微小生物——病毒。病毒在生物圈中的分布十分
Content analysis of the textbook This lesson contents for the second chapter of the second edition of the second edition of the textbook teaching biology. In the biosphere are single-celled organisms and multicellular organisms, but also a class is no cell structure, living in living cells in the tiny creatures - viruses. The virus is well distributed in the biosphere