What Is The Main Idea Of The Endosymbiosis Theory?

What Is The Main Idea Of The Endosymbiosis Theory? The endosymbiotic theory states that some of the organelles in eukaryotic cells were once prokaryotic microbes. Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission. Mitochondria and chloroplasts have their own DNA which is circular, not linear. What is the