Which of the following best explains the endosymbiosis theory of how eukaryotic cells originated, as shown below? A. Eukaryotic cells developed from mutations in prokaryotic cells B. Eukaryotic cells developed from organic compounds carried to Earth by debris from space
C. Eukaryotic cells originated from a combination of gases and heat in the atmosphere
D. Eukaryotic cells were originally large prokaryotic cells that absorbed smaller prokaryotic cells