Final answer:
There is one eukaryotic domain known as Eukarya, which encompasses all organisms with eukaryotic cells, including both unicellular and multicellular organisms.
Step-by-step explanation:
There is one eukaryotic domain.The domain Eukarya is unique in that it houses all life forms with complex cells containing membrane-bound organelles and nuclei. This domain encompasses a wide range of organisms, including all multicellular forms such as plants, animals, and fungi, and many unicellular organisms like protists. Unlike Bacteria and Archaea, which both consist of prokaryotic cells without a nucleus, the Domain Eukarya is characterized by its eukaryotic cell structure.
In terms of taxonomy, the domain Eukarya is further divided into several kingdoms, which are clustered into six supergroups. These supergroups reflect the evolutionary relationships among different eukaryotic organisms. The classification within the domain Eukarya is complex and subject to ongoing scientific debate, but all agree that there is a single, overarching eukaryotic domain.