Question

Describe how some cells came to have chloroplasts, according to the theory of endosymbiosis

Answer 1

Hint: chloroplasts look a LOT like cyanobacteria.

Answer 2

The endosymbiotic theory concerns the mitochondria, plastids (e.g. chloroplasts), and possibly other organelles of eukaryotic cells. According to this theory, certain organelles originated as free-living bacteria that were taken inside another cell as endosymbionts. Mitochondria developed from proteobacteria (in particular, Rickettsiales, the SAR11 clade,[1][2] or close relatives) and chloroplasts from cyanobacteria.
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