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                                                                 Phylum ; porifera 

                                                             

                                                              Example ;  sponges

 

 

 Sponges   are  simple  multicellular  aquatic  animals. This    phylum   includes 5000  species . They contain  pores. They   are mostly  found   in marine water   and   only  a  few are found  in  freshwater  . Body  is  usually  cylindrical  .The  scleroblasts  secrets  spicules  while sponge  fibres are  secreted  by  spongioblasts. They  feed  by filtering small  organisms from  from  water . They cant move   and attached  to a  substrate. . Respiration and   excretion  occur through  diffusion with the  water current  passing  through the  body.