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How do arthropods differ from echinoderms?

Sagot :

The primary difference between arthropods and echinoderms is their covering. Arthropods have a tough, non-living outer shell called exoskeleton, which protect their soft bodies while echinoderms have living endoskeletons, which develop within the deeper skin or body tissues and act as their protective covering.

 

Secondary difference is that most of the echinoderms live on water while arthropods are not.