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In nucleus. All life that has a nucleus and membrane-bound organelles, and most multi-cellular life, is included in the Eukarya.
Alternative classifications of life so far proposed include:
None of the three systems currently include non-cellular life. As of 2011 there is talk about Nucleocytoplasmic large DNA viruses possibly being a fourth branch domain of life, a view supported by researchers in 2012 who explain in their abstract:
The discovery of giant viruses with genome and physical size comparable to cellular organisms, remnants of protein translation machinery and virus-specific parasites (virophages) have raised intriguing questions about their origin. Evidence advocates for their inclusion into global phylogenomic studies and their consideration as a distinct and ancient form of life. [...] Results call for a change in the way viruses are perceived. They likely represent a distinct form of life that either predated or coexisted with the last universal common ancestor (LUCA) and constitute a very crucial part of our planet's biosphere.[7]
Archaea, Anthrax, Cheese, Cyanobacteria, Cholera
Amoebozoa, Bacteria, Rhizaria, Animal, Fungus
Bacteria, Crenarchaeota, Euryarchaeota, Sulfur, Acid
Biological classification, Class (biology), Species, Plural, Systema Naturae
Order (biology), Biological classification, Species, France, Taxonomic rank
Animal, Bacteria, Fungus, Rhizaria, Archaea
Rhizaria, Apicomplexa, Hacrobia, Alveolata, Chromalveolata
Rfam, Gene, Magnesium, Rna, Enzyme kinetics
Bacteria, Animal, Evolution, Astrobiology, Science