Which of the following are the three domains of life?

The three domains of life are Bacteria, Archaea, and Eukarya. This classification reflects the fundamental differences in the cellular organization and genetic makeup of these groups.

Bacteria are unicellular organisms that have a simple cell structure without a nucleus and are widespread in various environments. Archaea also consist of unicellular organisms, but their cell membranes and genetic sequences are distinct from those of bacteria, often allowing them to thrive in extreme environments. Eukarya includes organisms with complex cells that contain a nucleus and organelles, encompassing a wide range of life forms, including animals, plants, and fungi.

This three-domain system is based on genetic and evolutionary relationships, which provide a more accurate picture of life's diversity compared to the traditional five-kingdom system that includes options like plants and fungi as separate kingdoms. This highlights the significance of molecular biology in modern taxonomy, illustrating how genetic similarities and differences among organisms inform our understanding of their place in the tree of life.