Both mitochondria and chloroplasts are thought to have evolved by the process of
A) endosymbiosis.
B) sexual selection.
C) allopatric speciation.
D) sympatric speciation.
E) more than one of these.

Question

Quizplus · Accepted Answer

Both mitochondria and chloroplasts are believed to have evolved by the process of endosymbiosis, where an organism engulfs another organism and they form a symbiotic relationship over time. In the case of mitochondria and chloroplasts, it is thought that they were once free-living bacteria that were engulfed by ancestral eukaryotic cells, leading to the formation of the first eukaryotic cells with these organelles.

Both Mitochondria and Chloroplasts Are Thought to Have Evolved by the Process