Opening of water vascular system is called_______________.

Osculum

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Ostium

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Madreporite

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Mouth

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Solution

The correct option is C Madreporite
The pore canals unite to form collecting canals which open into a small sac-like ampulla, called madreporic ampulla. The sea water that operates the hydraulic system enters and leaves the water vascular system through the madreporite.

So, the correct answer is 'Madreporite'.

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