Tones of evidence -- from comparative genetics, the fossil record, the geographical distribution of species, radiometric dating of fossils in sedimentary rocks -- come together to confirm the fact of Evolution.
But what if the opposite was true; that Intelligent Design was a fact? Leaving aside the many arguments against I.D, let's try to imagine what we would expect to see, or not see, in nature if I.D was a fact.
My first guess would be this: If I.D were a fact, we would not expect to see vestigial limbs -- as we see in the hidden "legs" of some creatures that nolonger walk -- whales and snakes, for example.
So, to repeat my question: what would you expect to see, or not see, in nature if I.D was fact?