Answer:-
The endosymbiotic theory explains how complex cells (eukaryotic cells) evolved from simple ones (prokaryotic cells). It suggests that long ago, a larger cell engulfed smaller bacteria, which then lived inside it in a symbiotic relationship. Over time, these bacteria became permanent parts of the cell, evolving into organelles like mitochondria and chloroplasts. This theory helps explain why these organelles have their own DNA, similar to bacteria. Proposed by biologist Lynn Margulis, it’s widely accepted as a key process in the evolution of life, showing how cooperation between organisms led to the development of more advanced life forms.
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