Scientists now classify all species into three domains. The domains Archaea and Bacteria contain prokaryotic, single-celled organisms. The domain Eukarya contains eukaryotic organisms, including plants, animals, and fungi. Each domain is a valid clade. Which statement can be concluded about all species in domain Eukarya? A. Their most recent common ancestor was either archaea or bacteria. B. Their most recent common ancestor was neither archaea nor bacteria. C. They descended from several prokaryotic ancestors that were unrelated to one another. D. They descended from several eukaryotic ancestors that were unrelated to one another.