Studies of mitochondria and chloroplasts, which are assumed to have originated from bacteria living in big cells, provide credence to the notion that eukaryotic cells arose from a symbiotic relationship of prokaryotes called endosymbiosis.
According to the dominant explanation, known as the endosymbiotic theory, eukaryotes developed when an ancient Archaean cell fused with an aerobic, ancient bacterial cell (without actually eating it).
Eukaryotes are creatures whose cells contain nuclei Eukaryotes include all animals, all plants, all fungi, and many unicellular creatures. They are a part of the Eukaryota or Eukarya group of organisms, one of the three categories of life. The other two domains are represented by prokaryotes Bacteria and Archaea.
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