Question

echinodermata's arrangement inside their body helps them in locomotion

Answer 1

Echinodermata's have tentacle-like structures called tube feet with suction pads situated at their extremities. These tube feet are hydraulically controlled by a remarkable vascular system. ... When water returns to the canals, suction is released. The resulting locomotion is generally very slow.Thus , Echinodarmata's arrangement inside their body helps in their locomotion.