In $Echinodermata$,the excretory organ is .........

Radial symmetry occurs in

An enterocoelomate invertebrate group is

An animal phylum having radially symmetrical adults but bilateral symmetrical larvae is

Role of the water vascular system in Echinoderms is :
$A.$ Respiration and Locomotion
$B.$ Excretion and Locomotion
$C.$ Capture and transport of food
$D.$ Digestion and Respiration
$E.$ Digestion and Excretion
Choose the correct answer from the options given below :

Tube-feet are the locomotory organs of