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Which of the following statements regarding Chondrichthyes may not be true for majority of members of the class?

1.	Notochord is persistent throughout life.
2.	Skin has placoid scales.
3.	Fertilization is internal.
4.	Mouth is located ventrally.

Subtopic: Comparative study of Cartilagenous & Bony Fishes | Class Chondrichthyes |

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