Endosymbiosis

Chart: "Endosymbiosis", three categories depict primary, secondary and tertiary comparisons

Caption: The primary has three stages: (1) protist engulfs prokaryote (2) gene transfer (3) first alga
The secondary has three stages: (1) protist engulfs alga (2) gene transfer (3) untitled
The tertiary has three stages: (1) protist engulfs alga with secondary plastid (2) gene transfer (3) dinoflagellates

Source: D. Bhattacharya et al. Univ. of Iowa

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