Explain endosymbiont theory.

The endosymbiont theory is a widely accepted concept in biology that explains the origin of certain organelles in eukaryotic cells, particularly mitochondria and plastids, such as chloroplasts. The theory proposes that these organelles were once free-living prokaryotic organisms, which entered into a symbiotic relationship with a host cell. Over time, these prokaryotes became an integral part of the host cell, evolving into the organelles we see today.

The endosymbiont theory was first proposed by American biologist Lynn Margulis in the 1960s. Margulis suggested that mitochondria and chloroplasts share ___ ____ _____ ___ ___ _____ _______ ______ _________.
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