Which phylum exhibits bilateral symmetry in the larval stage and radial symmetry in the adult stage?

What does the water vascular system consist of?

Animals of the phylum Echinodermata are:

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 :

Which type of symmetry is exhibited by the animal shown below?

The organs of locomotion in Echinoderms are . . . . . . .