Final answer:
Swift Foxes belong to the Domain Eukaryota because they are animals with cells that contain nuclei. This is based on the three-domain system of classification, which also includes Bacteria and Archaea for prokaryotic organisms.
Step-by-step explanation:
The taxonomic Domain that Swift Foxes are in is Eukaryota. Swift Foxes, like all animals, are classified under this domain because they have cells with a nucleus and other membrane-bound organelles.
The three domains of life are Bacteria, Archaea, and Eukaryota. While both Bacteria and Archaea consist of unicellular prokaryotic organisms without a nucleus, the Eukaryota Domain encompasses all life forms with cells that contain a nuclear membrane, including plants, animals, fungi, and protists. Since Swift Foxes are animals with complex cellular structures, including cells with nuclei, they belong to the Domain Eukaryota. This classification is based on the phylogenetic tree developed by Woese and Fox, which utilized ribosomal RNA sequences to distinguish the three domains.