Answer:
The endosymbiosis hypothesis proposes that some organelles which occur in eukaryotes occurred as prokaryotic cells in the past.
Some of the evidence which supports this theory is:
- The size of the organelles, chloroplast and mitochondria, is similar to that of the bacterial cell.
- Organelles like mitochondria and chloroplast posses their own DNA which is capable to make proteins.
- The function of mitochondria is similar to purple- aerobic bacteria. They use oxygen for the synthesis of ATP. The process of Kreb's cycle and oxidative phosphorylation re similar in both.
- Chloroplast is similar to photosynthetic bacteria. Both posses chlorophyll.
