Tube feet
a water vascular system
sid is awsome'
Dens are unique to the axis.
Aristides identified Christianity as the unique feature of the Roman Empire.
A unique feature is that it has many tall towers with curving sides that taper at the top.
They are unique by being unique.
8=D
No idea! Srry ;
ungas
The name echinoderm means "spiny skin." Echinoderms have spines of various lengths that cover the outside of their bodies. Most echinoderms are supported and protected by an internal skeleton made up of bonelike plates. Echinoderms have a simple nervous system but don't have heads or brains.
A unique land feature is the space needle
water vascular system
Their poly symmetric structure