dra is a solitary, fresh-water organism that has its place in the taxonomy as Phylum   -----  Coelentrata  Class      -----  Hydrozoa  Order      ----   Hydroidea  Genus     ----   Hydra. Structure It is a polypoid, tubular and cylindrical coelenterate measuring growing to a maximum of 1 CM. The proximal end called BASAL disc contains the GLAND cells.  The distal end has the mouth called hypostome which is encircled with slender tentacles. FEEDING - It feeds on insect larvae and CRUSTACEANS.  Jelly Jelly commonly known as jelly fish has the taxonomy as followsPhylum    ---- Coelentrata Class       ---- Scyphozoa Order      ---- Semaeostomeae Genus     ---- Aurelia (Jelly fish)Structure: It has a transparent circular body with a mouth on the concave surface.Feeding: Carnivorous as it feeds on small aquatic animals.Earthworm:Earth worm has the following taxonomyPhylum     ---- Annelida Class        ---- Oligochaeta Order       ---- Neooligochaeta Genus      ---- Pheretima Structure: It has a long narrow segmented body.Feeding: It feeds on organic matter such as dead leaves, fruits. It also eats small microorganisms.