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2015-11-28T18:07:40+05:30
Molluscans are the fresh water organisms covered by hard shell made of caco3
ex: snails, unio
echinodermata are marine organisms withspines or throns on their body ex: starfish,octupus
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2015-11-29T12:31:40+05:30
Similarities:-
They both possess symmetrical bodies and have open circulatory system. 
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