Here's why:

* Eukaryotic cells are complex cells with a true nucleus and other membrane-bound organelles. This allows for specialization and organization within the organism.

* Prokaryotic cells, on the other hand, are simpler cells without a nucleus or other internal compartments. They are found in single-celled organisms like bacteria and archaea.

Therefore, the intricate structure and functionality of multicellular organisms rely on the sophisticated organization and capabilities of eukaryotic cells.