Which of the following provides evidence that mitochondria and chloroplasts were once free- living prokaryotic organisms?

Name: Which of the following provides evidence that mitochondria and chloroplasts were once free- living prokaryotic organisms?
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Mitochondria and chloroplasts contain their own DNA, which is separate from the nuclear DNA, suggesting they were once independent prokaryotic organisms that were engulfed by a host cell. This is a key aspect of the endosymbiotic theory.

Which of the Following Provides Evidence That Mitochondria and Chloroplasts