Hi
Of course Creationism isn't a valid alternative hipothesis because it doesn't explain how species appeared over the planet. But controversy exist on the fossil record completeness Objections to evolution - Wikipedia, the free encyclopedia, and on the study of the evolution of human languages (I'm a neofit, was read it in a Watchtower's book).
Is the biologic evolution an incontrovertible fact? If not, biologists consider any other alternative hipothesis?