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Subclass Hierarchy Tree

- 實體
     - 物質的
          - 物體
               - 自身連續物體
                    + 物質
                    - 複雜體/非單質體
                         - 有機物
                              - 生物體
                                   + 植物
                                   - 動物
                                        - 脊椎動物
                                             - 冷血脊椎動物
                                                  * 兩棲類
                                                  * 魚類
                                                  * 爬行動物
                                             + 溫血脊椎動物
                                        + 無脊椎動物
                                   + 微生物
                                   * 毒性生物
                              + 解剖構造
                         + 人造物
                    + 內容載體
                    + 食物
               + 區域
               + 群集
               + 施事者
          + 歷程
     + 抽象的