In Echinodermata,tube feet are related with

Absence of excretory organs,high power of regeneration,and exclusively marine; these are the characteristics of the phylum:

The water vascular system in phylum $Echinodermata$ helps in

Mark the correct combination of Phylum,Class,and Example.

Respiration by dermal gills $(branchiae)$ and respiratory tree is performed by the animals of

Animals that exhibit bilateral symmetry in the larval stage and radial (pentamerous) symmetry in the adult stage belong to the phylum: