I've read about his in a magazine, I think its called oviperuos sharks if i am not mistaken. Most in sharks family give birth but a quarter of them lay eggs.
Correct me if i am wrong.
Some sharks maintain a placental link to the developing young, this method is called viviparity.
This is more analogous to mammalian gestation than that of other fishes. The young are born alive and fully functional.
Hammerheads, the requiem sharks (such as the bull and blue sharks), and smoothhounds are viviparous, i.e., they do not lay eggs.
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