(2006-24) which of these organisms contains no specialized cells? paramecium sea anemone jellyfish sponge

The organism that has no specialized cell is Paramecium. 
Paramecium are members of the phylum Ciliophora. They feed on organisms like bacteria, algae, and yeasts . These organisms uses cilia to sweep the food along with some water into the cell after it falls into the oral groove. The food then goes through the cell mouth into the gullet.