Specialized excretory organs are absent in_______________.

Asterias

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Sepia

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Unio

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Pila

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Solution

The correct option is B Asterias
Asterias lacks well specialised excretory organs.
The nitrogenous metabolic excretory waste usually contains ammonium compounds.
They pass from various tissues into the coelomic fluid and from there they diffuse through the thin walls of the rectal caeca, tube feet and gills.

So, the correct answer is 'Asterias'.

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