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CLASSIFICATION OF ANIMALS, , “T =, , (Ctenophora | | |, a, , Hemichordata, Chordata, , Phylum — Porifera (Sponges), , Habitat — Aquatic ~ generally marine, some are fresh water., Symmetry ~ mostly asymmetric., Organization level — multicellular with cellular level of organisation., , Canal system — Sponges have a water transport or canal system. Water enters through, minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes, out through the osculum.