The three domains of the Tree of Life are: Eubacteria (true bacteria), Archaea, and Eukarya (Eucarya).
The first two, Eubacteria and Archaea, are prokaryotic cells with microbes that lack membrane-enclosed nuclei and organelles. The third domain, Eukarya, contains the eukaryotes and includes unicellular microorganisms together with the four original kingdoms (excluding bacteria).
According to the Astrobiology Magazine, as new forms of life were discovered and our knowledge of life on Earth grew, new categories, called Kingdoms,’ were added. There eventually came to be five Kingdoms in all Animalia, Plantae, Fungi, Protista, and Bacteria.
The five Kingdoms were generally grouped into two categories called Eukarya and Prokarya. Eukaryotes represent four of the five Kingdoms (animals, plants, fungi and protists). Eukaryotes are organisms whose cells have a nucleus, a sort of sack that holds the cell’s DNA. Animals, plants, protists and fungi are all eukaryotes because they all have a DNA-holding nuclear membrane within their cells.
The five Kingdoms were generally grouped into two categories called Eukarya and Prokarya. Eukaryotes represent four of the five Kingdoms (animals, plants, fungi and protists). Eukaryotes are organisms whose cells have a nucleus, a sort of sack that holds the cell’s DNA. Animals, plants, protists and fungi are all eukaryotes because they all have a DNA-holding nuclear membrane within their cells.
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