Question

1) The ring canal, forms five polian vesicles on the----
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Answer 1

The stone canal descends from the madreporite to the ring canal, which lies around the oesophagus, and includes a number of polian vesicles. Because sea urchins have no arms, the five radial canals simply run along the inside of the solid skeletal "test", arching upwards towards the anus.

Answer 2

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Explanation:

Sea urchins is Correct