Domains of Life

Domains of Life

Scientists classify all living things into three major groups called domains, which organize life based on shared characteristics at the most fundamental level. The three domains are Bacteria, Archaea, and Eukarya, each containing unique organisms with distinct structures and ways of living.

• Bact...

All living things on Earth are classified into three main domains: Bacteria, Archaea, and Eukarya.

Bacteria are single-celled organisms without a nucleus, known as prokaryotes. Their cell walls contain peptidoglycan, which gives them structure and protection. Bacteria are found almost everywhere—soil, air, and even inside your body!