Final answer:
Archaea in domain Archaea are all unicellular organisms and have cell walls lacking peptidoglycan.
Explanation:
Archaea characteristics:
- They are all unicellular organisms. Unlike eukaryotes, archaea lack a nucleus or membrane-bound organelles.
- They have cell walls that lack peptidoglycan. This is a key feature that distinguishes archaea from bacteria.
Learn more about Characteristics of Archaea in domain Archaea here:
https://brainly.com/question/39056781