What are the three domains of life?

The three domains of life are Archaea, Bacteria, and Eukarya, which represent the broadest categories of biological classification. This system was proposed by Carl Woese in the late 20th century based on genetic analysis, particularly ribosomal RNA sequences.

Archaea and Bacteria encompass prokaryotic organisms, which lack a membrane-bound nucleus. While these two groups share some similarities, they are genetically distinct. Archaea often thrive in extreme environments, such as hot springs or highly saline waters, and have unique biochemical pathways and membrane lipids that differentiate them from Bacteria.

Eukarya, on the other hand, consists of organisms whose cells contain a nucleus and other membrane-bound organelles. This domain includes a diverse range of life forms, such as animals, plants, fungi, and protists.

In contrast, the other options propose combinations that include illegitimate categories or groups, such as viruses or fungi, which do not fit within the three primary domains defined by modern biological classification. Viruses are not considered living organisms in the traditional sense as they require a host cell for replication and do not possess the cellular structure that characterizes Archaea, Bacteria, and Eukarya. Fungi, while distinct