(W) Echinodermates are marine, slow moving, gregarious animals. Which of the following belong to...

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(W)
Echinodermates are marine, slow moving, gregarious animals. Which of the following belong to echinoderms ?
(i) Sea horse
(ii) Sea urchin
(iii) Sand dollar
(iv) Sea anemone
(a) (i) and (iv) only
(b) (ii) and (iii) only
(c) (i), (ii) and (iii) only
(d) (ii), (iii) and (iv) only
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