Question

Ambulacral grooves are absent in the living forms of the class:
(i) Crinoidea
(ii) Ophiuroidea
(iii) Asteroidea
(iv) None of the above​

Answer 1

Answer:

ophiuroidea is the correct answer

I hope it helps you

Answer 2

Answer:

Ophiuroidea

Explanation:

The excretory system is replaced by a water vascular system in the organism of this class. Complete answer: Ambulacral grooves are absent in the living forms of the class Ophiuroidea. These are replaced by ossicles in the animals belonging to the class Ophiuroidea.

PLS MARK THE ANSWER AS BRAINLIEST IF IT IS HELPFUL TO YOU...............