1.

Which arrangemant inside there body helps them in locomotion

Answer»

Echinodermata's arrangement inside their body HELPS them in locomotion.

Explanations---------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.


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