Ambulacral grooves are absent in which Class of Echinodermata:

(a) pelmatozoa
(b) Ophiutoidea
(c) Crinoidea
(d) Asteroidea

Anurag Mishra Professor Asked on 28th May 2016 in Biology.
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    Answer: (b) Ophiutoidea

    Anurag Mishra Professor Answered on 30th May 2016.
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