Sponges are not symmetrical (asymmetrical) with no tissue organization. The Sponge only has 1 digestive opening, but has pores. They are filter-feeders and they attach to the surface of the ocean floor. Water enters through the pores and leaves through the pores.
Natural sponges protect babies delicate skin and is suitable for all ages. The natural sponge is a renewable natural resource. They also keep the oceans clean by being filter feeders. They also are the most natural way to clean your skin.