In which domain can a prokaryote be classified?

Prokaryotes are classified into two primary domains: Archaea and Bacteria. The domain Archaea encompasses prokaryotic organisms that are distinct from Bacteria and are often found in extreme environments, such as hot springs and salt lakes. They possess unique biochemical and genetic characteristics that differentiate them from other life forms.

In the context of the question, the mention of Archaea reflects the understanding that prokaryotes lack the membrane-bound organelles found in eukaryotic cells, such as those classified under the domains Eukarya, which includes animals, plants, fungi, and protists. Chordata and Animalia are kingdoms within the Eukarya domain and refer specifically to more complex multicellular organisms that are not prokaryotes at all. Therefore, the classification of prokaryotes under the domain Archaea is well-founded scientifically.