five differences between Mollusca and Echinodermata

Molluscs Echinodermata
Soft bodies covered with shell. Body covered with spiny epidermis, absence of shell.
Bilateral symmetry Radial symmetry
Presence of head   Absence of head
Open circulatory system.  Water vascular system
Muscular foot which helps to move.  Tube feet help to move.
 
 

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