The Phylum - Porifera
Sponges are the simplest of the multicellular animals. They are characterized by numerous canals, tunnels, and chambers that open to the outside by way of pores which giving this phylum its name. They are ancient but age isn't enough to prove that they are our ancestors.
Sponges do not have a nervous system, brain or any organs. Their body is defined by a system of cells and they have no shape. The cells have a very unique way of working together but they all work for the common good. Amoebocytes carry on other jobs. …
