Which of the following represents the three domains of life?

The correct answer identifies the three domains of life as Bacteria, Archaea, and Eukarya. This classification is fundamental in biological taxonomy and reflects the major divisions in the diversity of life on Earth.

Bacteria are unicellular organisms that lack a nucleus and are characterized by their simple cellular structure. They are prokaryotes, meaning their DNA is not enclosed in a membrane-bound nucleus.

Archaea also consist of unicellular prokaryotic organisms, but they differ significantly from bacteria in their genetic and biochemical properties. Archaea often inhabit extreme environments and have unique adaptations that differentiate them from both bacteria and eukaryotes.

Eukarya includes all organisms whose cells have a nucleus and membrane-bound organelles. This domain encompasses a wide variety of life forms, including plants, animals, fungi, and protists, representing a complex level of cellular organization.

This classification system highlights the evolutionary relationships and diversity among organisms, which is critical for understanding the biology of different forms of life.