Paleontologist and embryologist J. G. M. "Hans" Thewissen noticed that the ear bone of Indohyus (a deer-like mammal) that had broken off in his lab was razor thin on one side and very thick on the other, making it unlike the ear bone of any other land mammal. Ultimately, this discovery shed light on the evolutionary history of whales. Which statements about whales and Indohyus are correct?

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