Locomotion in Cockroach: Locomotion in arthropods is brought about by the interaction of the muscular and exoskeletal system of its jointed legs. The legs act as efficient levers and make the movement much more fast and swift. In cockroach muscles are attached to the inside of exoskeleton of legs. These anatagonistic muscles work in opposition to one another. Contraction of these flexor and extensor muscles move the appendages and the animal. The swift and fast movement of an arthropoda makes it better adapted to catch a prey and escape a prdator, a key to their success which resulted in their wide spread distribution. Cockroach like many other insects is blessed with wings for flight adding a lot of their mobility. Locomotion-in-cockroach(learn-4-future.blogspot.com)

Locomotion In Protozoa: 

          Locomotion in Protozoa, a group of protoctists is usually carried out by appendages like outgrowths of the cell body. These are of three types i.e. Pseudopodia in Amoeba, Cilia in paramecium and flagella in Euglena.