An organelle is found to have its own DNA and to make some of its own ribosomes and protein without the help of DNA in the cell's nucleus. Such organelles probably evolved from what were once:

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The description matches characteristics of mitochondria and chloroplasts, which are believed to have evolved from endosymbiotic relationships with prokaryotic organisms, supporting the endosymbiotic theory. This theory suggests that these organelles were once independent organisms that started living inside larger cells in a mutually beneficial relationship.

An Organelle Is Found to Have Its Own DNA and to Make