Which of the following traits is not a c...

Which of the following traits is not 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.

I and II

II and III

Only III

I and IV

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