Practice question

MCQ

Question

Which of the following features is incorrect regarding echinoderms?

Options

Choose one · Correct answer highlighted

They have an endoskeleton made of calcareous ossicles They have a closed circulatory system Correct They show radial symmetry in adults They use a water vascular system for locomotion

Explanation

Echinoderms do not have a closed circulatory system; they rely on their water vascular system for circulation.

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