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.

                                                                      PHYLUM; PROTOZOA

                                                    Example:Amoeba

Amoeba   is   a  microscopic    creature   found  in  freshwater.  It  is  a  single  celled  organism  and   it has  no  definite shape.  It  has  the ability  to   change   its  shape. Amoeba   move  and  feed  by  extending   temporary  structure  called   pseudopodia  . It   is  a  temporary  arm – like  projection   of    eukaryotic cell membrane  and  it can  be moved  for  its  desired  direction with  the  co-ordinated action  of  microfilaments  in the cytoplasm  pushing  out  the  plasma  membrane which  surrounds  the  cell    when  freely  floating    amoeba  may  produce  many  pseudopodia.

FEEDING;

 Feeding   by  phagocytosis  in  which  extending   pseudopodia to encircle  and   engulf  live prey.

 PATHOGENIC   AMOEBA :

  Entamoeba  histolytica   is  the cause of  amoebic dysentery.