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This Concept Map, created with IHMC CmapTools, has information related to: 11_tutorial(1b)_syuhada, Flatworm has narrow body, around pharynx and several nerve cords, Annelida example Ascaris lumbricoides, bilaterally symetrical and Tripoblastic pseudocoelomates, nerve ring around pharynx, internal fertilisation through Dioecious, Annelida body cavity is Tripoblastic coelomates, Annelida ???? gaseous exchange, Flatworm ???? CNS, Flatworm ???? internal fertilisation, CNS consist of nerve ring, Tripoblastic coelomates and bilaterally symetrical, Nephridium for urea excretion organ, Differences between annelids and flatworm Phylum Annelida Annelida, exoskeleton which is tough cuticle, Flatworm has round body, Dioecious which mean female and male are seperate, worm-like animal that has segmented body, narrow body that pointed at both end, nereis sp Hiruda medicinalis