Write the missing correlated terms.
Bivalve: mollusca: : Sea urchins :
(c) Bivalve: mollusca: : Sea urchins : Echinodermata
Echinoderms are spiny skinned organisms and have water vascular system which helps in the locomotion, capture and transport of food and respiration.
They are exclusively free-living marine animals. Example :- Sea urchins.