The Endosymbiont Theory postulates that some organelles in cells were once independent organisms.

Name: The Endosymbiont Theory postulates that some organelles in cells were once independent organisms.
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The Endosymbiont Theory proposes that some organelles, such as mitochondria and chloroplasts, were once free-living prokaryotic cells that were engulfed by a larger cell and developed a mutually beneficial relationship, eventually becoming integrated as organelles within a eukaryotic cell.

The Endosymbiont Theory Postulates That Some Organelles in Cells Were