it is usually with 5 arms
like a starfishes....
tube feet
Yes it does
34759234875-134957
legs.
what aver
Echinoderms are a phylum with usually 5 fold symmetry, spines and calcium carbonate plates.
water vascular system
openings
their body plan
The madreporite is the structure that is part of an echinoderm's water vascular system. It acts as a sievelike structure that allows water to enter the system and is connected to the internal canals of the water vascular system.
Adult echinoderms only have one body opening. Their larvae have two.