Final answer:
Archaea and bacteria are prokaryotic organisms that share similarities in structure and function. They are both unicellular, lack a nucleus, and can reproduce asexually. Both archaea and bacteria can also have flagella for movement.
Step-by-step explanation:
Archaea and bacteria are both prokaryotic organisms that have similarities in structure and function. Both are unicellular and lack a nucleus and membrane-bound organelles. They also have circular chromosomes and can reproduce asexually. Additionally, both archaea and bacteria can have flagella for movement.