How are organsims in the domain archaea different from those in the domain eukarya?

Organisms in the domain Archaea are unicellular prokaryotes without a nucleus, membrane-bound organelles, or introns in their genes. They also have unique cell wall components. Eukaryotes in the domain Eukarya, on the other hand, have a nucleus and membrane-bound organelles, are typically larger and more complex, and can be unicellular or multicellular.