Water vascular system is the characteristic of which group of the following:
$(a)$ Porifera $(b)$ Ctenophora $(c)$ Echinodermata $(d)$ Chordata

Whose body wall is made of calcium carbonate?

Select the incorrect statement for the organism given below:

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 :

In Echinodermata,the digestive tract is ..........

Which phylum does an animal belong to that exhibits bilateral symmetry in the larval stage and pentamerous radial symmetry in the adult stage?