Final answer:
Chloroplast was derived from free-living bacteria and incorporated into a eukaryotic cell.
Explanation:
Chloroplast was derived from an ancestral free-living bacteria, specifically from a photosynthesizing prokaryote similar to present-day cyanobacteria. This process is supported by the endosymbiotic theory, where the chloroplast was once an independent organism that became incorporated into a eukaryotic cell.
Learn more about Chloroplast and endosymbiotic theory here:
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