What is the name of the process by which mitochondria and chloroplasts probably evolved?

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Endosymbiosis is the process by which mitochondria and chloroplasts, two major organelles found in eukaryotic cells, are thought to have evolved. This theory suggests that these organelles were once independent prokaryotic organisms that were taken up by a host cell through a symbiotic relationship, eventually becoming integral parts of the cell.

What Is the Name of the Process by Which Mitochondria