Chloroplasts and mitochondria in eukaryotes are thought to have originated by _____, wherein one organism lives inside another.

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Endosymbiosis theory proposes that chloroplasts and mitochondria in eukaryotes originated from free-living prokaryotes that were engulfed by another cell but not digested, and eventually formed a symbiotic relationship with the host cell. This theory is supported by several lines of evidence, including the presence of their own DNA and ribosomes, similar to those found in prokaryotes, and the ability to replicate independently of the host cell.

Chloroplasts and Mitochondria in Eukaryotes Are Thought to Have Originated