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Ambulacral grooves are absent in the living forms of the Class

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Ambulacral grooves are absent in the living forms of the Class

(a) Crinoidea

(b) Asteroidea

(c) Ophiuroidea

(d) Echinodermata.

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The correct option is: (c) Ophiuroidea

Explanation:

Ambulacral grooves are found in the arms of echinoderms lined by tube feet. Ambulacral grooves are absent in ophiuroidea which are covered by ossicles.

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