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which one of the following statements is not correct

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Q.

Which one of the following statements is not correct?

[A] All echinoderms are viviparous.

[B] Round warm has no circulatory system.

[C] In bony fishes, swim bladder is usually present.

[D] In cartilaginous fishes, fertilization is internal.

Answer & Explanation
Option: [A]

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