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My question is about invertebrates about echinoderms like starfish, sea urchin, and etc... But the only thing i came here is the answer to my question... What is the harmful effects of echinoderms?
ANSWER: The echinoderm is that it contains 5 classes including the Crinoidea or feather stars, Asteroidea orstar-fish,Ophiuroideaor brittle stars,Echinoideaor sea-urchin ,sand Holothuroideaor s.
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