The five-kingdom system of classification reflects the idea that all organisms can be separated into two main groups: prokaryotes and eukaryotes. the new six-kingdom system recognizes three broader groups called domains, that include six kingdoms. how does the domain eukarya differ from the other two domains? a) all organisms in the domain are heterotrophic. b) all organisms in the domain are multicellular. c) all organisms in the domain have eukaryotic cells. d) all organisms in the domain have prokaryotic cells