Which one of the following statements is not correct?

Correct option is A

• Echinoderm is the common name given to any member of the Phylum Echinodermata of marine animals. 

• The adults are recognizable by their (usually five-point) radial symmetry and include such well-known animals as starfish, sea urchins, sand dollars and sea cucumbers. Most animals of phylum Echinodermata are oviparous and only some of them are viviparous. 

• Oviparous animals lay eggs, with little or no other embryonic development within the mother.

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