Very hardy orange aquacultured sponges on a piece of rock.Sponges are identified as Porifera and do not produce any tissue or organs. Sponges use small holes called "pores" to suck in water and pump it through the interior of the Sponge. As the water is filtered through the Sponge oxygen and food are removed. There are many different types of Sponge ranging in shape from balls to ropes. Sponges are one of the few animals that have no known protective defense mechanism or response to any threatening organism.
Orange Sponge - Aquacultured