The Eukaryotic domain consists of one unit. This domain contains all organisms with cells made of complex structures that are enclosed in endomembranes. The Eukaryotic domain, along with the Bacteria and Archae domains, forms the three domains of life.
The Eukaryotic domain is large and contains seven kingdoms. These kingdoms include: Animalia, Plantae, Fungi, Chromalveolata, Rhizaria and Excavata. Although organisms within these kingdoms share unique traits and characteristics, all eukaryotes have complex cells enclosed within complex membranes. Eukaryotes may be unicellular or multicellular, and the group includes plants, animals and fungi. Most species in this domain are protest microorganisms, and they have cells with distinct structures and nuclei .