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Which of the following traits is a characteristic of echinoderms?
I. They have a complete digestive system with two separate openings
II. They possess a complex haemal and perihaemal system for circulation
III. Removal of nitrogenous waste takes place through cloacal aperture
IV. Sense organs are poorly developed

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III

answer is A.

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Detailed Solution

In Echinoderms the hemal system poorly developed the nitrogen based removed from tube feet are body surface different sense organs are observed.

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