It is likely that the intracellular body within single-celled eukaryotes, which is called a chloroplast, was originally

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The presence of a chloroplast in single-celled eukaryotes suggests that these organisms acquired the chloroplast via endosymbiosis with a photosynthetic cyanobacterial cell. The chloroplast is thought to have originated from the cyanobacterial cell that was engulfed by the eukaryotic host cell but not digested, eventually developing into a specialized organelle.

It Is Likely That the Intracellular Body Within Single-Celled Eukaryotes