Animals are
marine, fresh water or terrestrial parasitic worm.
Body is
cylindrical, bilaterally symmetrical and covered by cuticle covering.
Body show
adaptations for parasitic mode of life.
Body –cavity is
pseudocoel.
Digestive system
is complete with mouth and anus.
Respiration
takes place by gaseous exchange. Circulatory system is absent.
Sexual
reproduction is found. Sexes are
separate. Internal fertilization occurs.
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