In humans, the yolk sac in humans, the yolk sac is the site of origin for blood cells and primordial germ cells is no longer a useful structure forms the human urinary bladder passes nutrients to the embryo after digesting the yolk mass

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls