Which of the following statements are incorrect?
(i) Parapodia are lateral appendages in arthropods that are used for swimming.
(ii) Rasping mouth-like organ present in molluscs, are involved in excretion.
(iii) Animals of Aschelminthes are dioecious (separate male and female).
(iv) Echinoderms adults show radial symmetry.
(v) Ctenophores are diploblastic.