Question: which one of the following living organisms completely lacks a cell wall?
Answer: Which one of the following living organisms completely lacks a cell wall? B. Sea-fan (Gorgonia) belongs to Kingdom-Animalia Phylom, Cnidaria and order: Gorgonacea. As it is on the animal, thus it lacks cell wall cyanobacteria of B we green algae (kingdom Monera) have a cell wall which is composed of peptidoglycan.