Which are more closely related to complex organisms, bacteria or archaea?

Archaea

Archaeal cells were as simple as bacterium cells. However, research indicates that these simple cells were closer to complex organism known as eukaryotes. This is on the basis of cladistic analysis.Unlike bacteria, archaeal can survive in the harshest of environments.

the answer to your question is slate

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive