地球上现存的生物,绝大多数都是具有相似的结构和功能单位。生物

地球上现存的生物,绝大多数都是具有相似的结构和功能单位。生物体的这个结构和功能单位是

A、细胞     B、系统      C、组织     D、器官

答案

A

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