Sponges or poríferos (Porifera ) they are a phylum of aquatic invertebrate animals that are situated within the Subkingdom Parazoa. They are mostly marine, sessile and lack true tissue. They are screeners with a developed system of pores and channels and Chambers. There are about 8,000 species of sponges in the world, 1 of which only about 150 living in fresh water. Known fossils of sponges ( a 41 hexactinélida; from the Ediacaran period () Neoproterozoic or upper Precambrian.2 Were considered plants until it was discovered the existence of internal flows of water in 1765 and they were recognized as animals and their digestion is intracelula
