Heart Urchin belongs to class

Asteroidea

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Ophiuroidea

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Echinoidea

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Holothuroidea

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Solution

The correct option is C Echinoidea
A) Members of Asteroidea are star shaped.
B) Members of Ophiuroidea are flat and star like.
C) Heart urchin (Echinocardium) belongs to Echinoidia. It is heart shaped.
D) Members of Holothuroidea are elongated and cylindrical.
So, the correct answer is 'Echinoidea'.

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