Why are true multicellular organisms known only among eukaryotes?

First, we recall the definition of eukaryotes and prokaryotes. Eukaryotes are organisms whose cells have membrane organelles in their structure. Prokaryotes do not have such organelles. Only two kingdoms of living nature belong to prokaryotes: bacteria and archaea. Some bacteria are made up of many cells, but they are not a single system. Such bacteria can lose some of their cells and continue to function as well. Archaea are single-celled organisms. Eukaryotes, on the other hand, create multicellular systems.