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The Grantia is type of sponge that like the rest of Porifera uses their layers and both their internal and external canals that circulate water to bring in dissolved oxygen and prey while removing waste products. Water enters the body of the sponge through the different canals in their body and this incoming water, bearing dissolved oxygen, dissolved solids, and suspended food enter their body through said canal and is used to give the sponge nutrients. The water then has an exit or excurrent canal for the sycon type sponges is a single, relatively larger opening where the water in released.