intracistron complementation

例句：

1. 1. The study of endosymbiosis is crucial for understanding the evolution of life on Earth.
   研究内共生体对理解地球上生命演化至关重要。
2. 2. Mutualism is a type of symbiosis in which both partners benefit from the relationship.
   互利共生是一种共生关系，其中双方从关系中受益。
3. 3.In this case, the two species coexisted through an endosymbiotic relationship, where one organism provided nutrients to another.
   在这种情况下，两种物种通过一种内共生关系共存，其中一种生物为另一种提供养分。