Why is eubacteria is different from the other kingdoms?

Eubacteria, or true bacteria, are distinct from other kingdoms due to their simple prokaryotic cell structure, lacking a nucleus and membrane-bound organelles. They have a unique cell wall composition primarily made of peptidoglycan, which differentiates them from archaea and eukaryotes. Eubacteria are also incredibly diverse, encompassing a wide range of metabolic pathways and habitats, enabling them to thrive in various environments. This adaptability and structural simplicity set them apart from the more complex organisms found in other kingdoms.