During early evolution in earth history, the ancestral cyanobacteria were annexed by early primitive eukaryotes and gradually evolved into chloroplast through symbiosis.

• 在漫长的进化过程中,蓝藻类的原核生物被原始的真核细胞吞噬入胞内,与宿主细胞长期共生,逐渐演化为叶绿体。