Are Archaebacteria Unicellular or Multicellular?

Like bacteria, organisms in domain Archaea are prokaryotic and unicellular. Superficially, they look a lot like bacteria, and many biologists confused them as bacteria until a few decades ago.

Are archaebacteria multi celled?

listen) ar-KEE-ə; singular archaeon /ɑːrˈkiːən/) constitute a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaebacteria kingdom), but this term has fallen out of use.

Are eubacteria multicellular or unicellular?

Eubacteria are unicellular prokaryotic cells.