Most are free-living, with well-developed systems. These are absent or reduced in parasitic forms (except reproductive system). Life cycle can be complex, with definitive and intermediate hosts. Sexual reproduction only occurs in the definitive host asexual reproduction may occur in the intermediate host. May be dioecious (separate sexes) or hermaphroditic (reproductive organs of both sexes in one body). Most parasitic forms are transmitted by ingestion of eggs (gastrointestinal route).
HELMINTHS (worms- Kingdom Animalia)PRIVATE