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According to the endosymbiotic theory, which organelles were believed to be once simple prokaryotic cells?

A. Mitochondria and Endoplasmic Reticulum
B. Endoplasmic Reticulum and Chloroplast
C. Endoplasmic Reticulum and Ribosomes
D. Mitochondria and Chloroplast

User RGA
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D. Mitochondria and Chloroplast

i'm sorry if it's wrong but that should be the right answer
User DecPK
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