It is incredibly sad what is happening to the shark population. Remember a few years back when taking "shark cartilidge" pills was all the rage as a nutritional supplement. Plus just the damage the movie/book "Jaws" did to how people view sharks. We will eventually hunt and kill them out of existence like so many other species
I don't think all sharks are live bearers. Some lay a leathery egg case, others bear young with a plecenta attached to the mother, others hold eggs and the young hatch inside the mothers, they eat their yolk sack and shell, then she expells them. One species in particular (I think sand tiger...not so sure and too lazy to look it up) their young hatch from their eggs inside the mother who has numerous eggs in each uterus. The oldest/strongest hatchling then eats all the others until the mother is ready to give birth. She has two uterus's which means only two juvenile sharks that she gives birth to each season. It amazes me that they have to fight just to survive long enough to be born.