原生体

例句：

1. 1. The study of prokaryotes is crucial for understanding the origins of life on Earth.
   研究原核生物对于理解地球上生命的起源至关重要。
2. 2. Prokaryotic cells are smaller and simpler than eukaryotic cells, making them more susceptible to environmental changes.
   原核细胞比真核细胞小且结构简单，因此更容易受到环境变化的影响。
3. 3. Many prokaryotic organisms play important roles in maintaining ecological balance and pollination.
   许多原核生物在维持生态平衡和传粉方面发挥着重要作用。