How did mitochondria and chloroplasts arise in eukaryotic cells?
A. Via the endomembrane system that enfolded in such a way as to create mitochondria and chloroplasts
B. Via binary fission, where bacteria divided to create mitochondria and chloroplasts
C. Via the endomembrane system that engulfed mitochondria and chloroplasts
D. Via endosymbiosis, where mitochondria and chloroplasts were independent prokaryotic organisms that were engulfed by a larger cell
Answer: D
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