Chloroplasts are proposed to have arisen after archaea cells engulfed Photosynthetic bacteria in endosymbiosis, allowing the engulfed cell to remain, with specialized function.
What is a bacteria?
Prokaryotes are microscopic living things that lack an organelle and a clearly defined nuclear membrane. One variety of prokaryote is bacteria. They can be found everywhere and are essential to both human health and sickness.
According to endosymbiotic theory, a big tiny Archaean organism absorbed a photosynthesis-capable microscopic living organism. It turned out to be a photosynthetic bacteria. The photosynthetic creature thrived inside the larger cell in a mutually beneficial connection rather than being digested. This little photosynthetic creature evolved into the chloroplast, an organelle.
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