The Porifera Phylum
The Phylum Porifera is made up of sponges. Sponges are considered animals because they are multicellular. The sponges live their lives attached to something else. Sponges are mostly found on the ocean floor, but some of them can be found in freshwater. There are about 5,000 species of sponges and all use a water filtration system to feed on the small food particles in the water.
Sycon
All the activities of their body depend on the current of water entering through ostia and passing out through osculum or oscula. Inside the body, water current flows through system of spaces which collectively constitute the canal system. The entire physiological activities of the animal depend on the water current and the exchanges between the body and the exterior arc maintained through the water current. The food and oxygen are brought through this current while excreta and reproductive bodies are excluded through this current
Sponge
They are multicellular organisms which have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and which often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most rely on maintaining a constant water flow through their bodies to obtain food, oxygen and remove wastes.