Mitochondria and chloroplasts likely evolved from engulfed prokaryotes that once lived as independent organisms. At some point, a eukaryotic cell engulfed an aerobic prokaryote, which then formed ...

What Is the Origin of Chloroplasts? Like mitochondria, chloroplasts likely originated from an ancient symbiosis, in this case when a nucleated cell engulfed a photosynthetic prokaryote.

Scientific consensus is that this happened twice over the course of evolution, resulting in the energy-generating organelles known as mitochondria ... differences could offer insight into ...