Which organelles are thought to have been independent organisms according to the Endosymbiotic Theory, and what features support this idea?

• A. Mitochondria and Chloroplasts; They possess a double membrane structure
• B. Ribosomes and Endoplasmic reticulum; They can synthesize proteins independently
• C. Peroxisomes and Proteasomes; They carry out oxidative reactions
• D. Golgi Apparatus and Lysosomes; They process proteins separately

Answer: (A)