Ninety-nine percent of all species that have ever lived have become extinct. All cases of extinction represent a failure to adapt. This fact poses an enormous problem for theories of intelligent design (ID). It doesn’t seem so intelligent to design millions of species that are destined to go extinct, and then replace them with other, similar species, most of which will also vanish. Intelligent Design supporters have never addressed this difficulty.
–biologist Jerry Coyne, Why Evolution is True, p. 12