Which one of the following doesnt have a aminotelic excretory system?

Asterias

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Unio

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Limnaea

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Oniscus

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Solution

The correct option is D Oniscus
Organisms which excretes amino acids are called aminotelic. Organisms like Asterias, Uni, Limnaea etc have an aminotelic excretory system. Oniscus is a land crustacean which excretes uric acid and falls into uricotelic category.
Since Oniscus is the odd one, the correct option is 'D'.

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