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The Endosymbiont Theory is a widely accepted explanation for the origin of eukaryotic cells, particularly the development of mitochondria and chloroplasts. According to this theory, certain organelles within eukaryotic cells were once free-living prokaryotic organisms that entered into a symbiotic relationship with a host cell. Over evolutionary time, these prokaryotes became permanent residents of the host cell, evolving into specialized organelles. The theory was first proposed by Lynn Margulis in the 1960s and provides a framework for understanding the origin of complex cellular structures in plants and other _____ ____ _____ ___ __________ ________ _________ _______.
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