参考图片中的细胞学说及生命结构层次---**Title:** 01 细胞学说 (Cell Theory)
**Subtitle:** 细胞学说的内容和意义 (Content and Significance of Cell Theory)
**Section Heading:** ▲ 基本内容 (Basic Content)
**Content:**
① 细胞是一个有机体，一切**动植物**都由细胞发育而来，并由**细胞和细胞产物**所构成。
(Cells are organisms; all **animals and plants** develop from cells, and are composed of **cells and cell products**.)
② 细胞是一个**相对独立**的单位，既有它自己的生命，又对与其他细胞共同组成的整体的生命起作用。
(Cells are **relatively independent** units, having their own life, and also contributing to the life of the whole organism formed by other cells.)
③ 新细胞是由**老细胞分裂**产生的。
(New cells are produced by the **division of old cells**.)