Final answer:
A domain is the highest taxonomic rank in biology, and there are three widely recognized domains: Archaea, Bacteria, and Eukarya.
Step-by-step explanation:
6. Describe the taxon called the domain, and compare the three widely recognized domains of living things.
In biology, a domain is the highest taxonomic rank of organisms. The three widely recognized domains of living things are Archaea, Bacteria, and Eukarya. Archaea and Bacteria consist of single-celled organisms that lack a nucleus, while Eukarya consists of organisms with a nucleus and includes plants, animals, fungi, and protists.