enlarged. The structure and formation of myelin in their nervous systems are nearly identical to that of tetrapods, which has led evolutionary biologists to believe that Chondrichthyes were a cornerstone group in the evolutionary timeline of myelin development.

Immune system

Like all other jawed vertebrates, members of Chondrichthyes have an adaptive immune system.

Reproduction

Fertilization is internal. Development is usually live birth (ovoviviparous

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