Echinoderms show

Which of the following statements are correct ? (i) Parapodia are lateral appendages in arthopods used for swimming . (ii) Radula in molluscs is excretory in function (iii) Aschelminthes are dioecious (iv) Adult echinoderms show radial symmentry . (v) Ctenophores are diploblastic .

X is an Echinoderm showing radial symmetry with water vascular system and tube feet. (a) An arm of X is damaged in an accident and later it was grown and regained its original form (a) Name the Echinoderm - X. (b) What is the biological phenomenon that led to the regain of lost arm?

What are Echinoderms ?

Echinoderms have

Echinoderms, hemichordates and chordates have a

Echinoderms, hemichordates and chordates have a

Echinoderms, hemichordates and chordates have a

An echinoderms is

Echinoderms are