self-existent

例句：

1. 1.The self-existing organism is capable of adapting to its environment.
   这个自我存在的生物能够适应其环境。
2. 2. The self-existing ecosystem is a complex network of interconnected species.
   这个自我存在的生态系统是一系列相互连接的物种组成的复杂网络。
3. 3.Self-existing organisms have the ability to reproduce and evolve independently.
   自我存在的生物具有繁殖和独立进化的能力。