The endosymbiotic theory hypothesizes that mitochondria and chloroplasts were formed when <u>prokaryotic </u>cells were engulfed by larger cells that were precursors to <u>eukaryotic </u>cells.
He endosymbiotic theory hypothesizes that mitochondria and chloroplasts were formed when prokaryotic cells were engulfed by larger cells that were precursors to eukaryotic cells.