HARITHA,Subject Matter Expert at Edumarz
Solution:Water vascular system is the unique feature of phylum Echinodermata.
It helps in locomotion,respiration and removal of waste materials from the body.
Features of phylum Echinodermata
They live in marine environments
Adults show radial symmetry and larvae show bilateral symmetry
They are coelomate organisms
Body is star shaped,flat,spherical or elongate
Tube feet is present
Nervous system is absent
Heart is not present
Absence of pigments in blood
Presence of complete digestive system
They show indirect development having a larvae stage
Reproduction by both sexual and asexual methods