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Subclass Hierarchy Tree

- 實體
     - 物質的
          - 物體
               - 自身連續物體
                    - 物質
                         + 純物質
                         + 混合物
                         - 活性生物物質
                              - 養份
                                   + 蛋白質
                                   * 碳水化合物
                                   * 維他命
                              * 荷爾蒙
                    + 複雜體/非單質體
                    + 內容載體
                    + 食物
               + 區域
               + 群集
               + 施事者
          + 歷程
     + 抽象的