This will always be the case whenever there are some extreme changes to the environment. Some species will thrive and some will go extinct. The Cretaceous–Tertiary (K–T) extinction event exterminated three quarters of all life. We are descendants of those mammals that made it through.
I remember reading somewhere that had it not been for that extinction event we probably would not be here. Don't know if it's true.
"Eye tissue analysis presented a probability range suggesting that the sharks were at least 272 years old, and could potentially be as much as 512 years old,"