Final answer:
The three domains of life are Archaea, Bacteria, and Eukarya, which encompass all living organisms, including prokaryotes without nuclei and eukaryotes with complex cellular structures.
Step-by-step explanation:
The three domains are Archaea, Bacteria, and Eukarya. As indicated in Figure 22.11, Bacteria and Archaea are both prokaryotes but are different enough to be placed in separate domains. They lack nuclei and other membrane-bound organelles. The Archaea domain includes many extremophiles living in harsh environments, and the Bacteria domain encompasses a diverse range of organisms. The third domain, Eukarya, is distinctly separate because it includes organisms whose cells have nuclei. The Eukarya domain comprises complex life forms, including the kingdoms of animals, plants, fungi, and various groups of protists. Therefore, the correct answer to this question is A. Archaea, Bacteria, and Eukarya.