In which of the following water vascular system acts as excretory system?

Myxine

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Carcharodon

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Balanoglossus

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Asterias

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Catla

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Solution

The correct option is D Asterias
Asterias or star fish is a triploblastic, radially symmetrical marine echinoderm, that crawls on the sea floor and preys upon molluscs. Excretory organs are lacking in starfish. Excretory material includes ammonium compounds, urea and creatine, which are released to the outside either through dermal branchiae or engulfed by amoebocytes. Water vascular system in them serves as excretory system.

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