New evidence suggests that fish once made a slow transition from aquatic creatures to land mammals, meaning they mutated at some point along the way, meaning some form of evolution occurred over millions of years, which means in your face, Palin:

The anatomy of this early transformation in life from water to land had never been observed with such clarity, paleontologists and biologists said in announcing the research on Wednesday.
The scientists said in a report being published Thursday in the journal Nature that the research exposed delicate details of the creature's head and neck, confirming and elaborating on its evolutionary position as "an important stage in the origin of terrestrial vertebrates."
In that case, the fish, a predator up to nine feet long, was a predecessor of amphibians, reptiles and dinosaurs, mammals and eventually humans. The fossil species was named Tiktaalik roseae, nicknamed "fishapod" for its fishlike features combined with limbs similar to tetrapods, four-legged land animals.

Yeah, what those scientists said! Also, if you watch Jurassic Park 3 pretty sure there is a part in there about how all dinosaurs eventually turned into chickens. So that's why T-rex's have arms that look like wings. And that's pretty much the most science you're going to get from me today.