3. What is a major physical characteristic that differs between members of Domains Archaea and Bacteria and members of Domain Eukarya? A. Members of Domain Eukarya are less complex than the members of Domains Archaea and Bacteria. B. Members of Domains Archaea and Bacteria are multicellular, and members of Domain Eukarya are usually single-celled organisms. C. Members of Domain Eukarya have cells with membrane-bound organelles, and members of Domains Archaea and Bacteria lack nuclei. D. Members of Domains Bacteria and Archaea have structures for making their own food, and members of Domain Eukarya lack these structures