This is a rehash of "if we evolved from monkeys why are there still monkeys" question. In the same way, if Americans came from Europe, why are there still Europeans?
they were exempted from the forces that have acted on other forms of life for billions of years--seems strange that any old form including sharks and crocks would not have had major evolutionary change when the Evolutionist tell us that Evolution is such a powerful force- why are these life forms not effected???
Ever hear of a local fitness maximum? Top-level predators don't have much pressure to change. But that notwithstanding, what makes you think evolution has no effect on sharks?
Perhaps you misapprehend what the theory of evolution actually says.