All living things are either Eukarya, Bacteria, or Archaea. These three broadest categories in the classification of life are called _______.
a. domains
b. kingdoms
c. orders
d. species
Because they are three, this is also called the Three-Domain System, which was introduced by Carl Woese. The Archaea and Eukaryota are more closely related, Bacteria being more distant from the two.
