Now consider evolution and creation. These diagrams shows what we would be expect to find in the fossil record. The vertical axis is time, and the horizontal axis is morphology (structure). If evolution happened, we would expect a slow and gradual change in structure over time; you wouldn’t expect a chicken egg to hatch a cat. Say an animal was evolving an appendage with fingers. We would expect to find some fossils with 1/4 of a finger, then maybe 1/2 of a finger, then maybe 3/4 of a finger, then finally a whole finger. We would expect to see a progression in the fossils, a lot of very similar fossils. Could there even be a catalog of fossils to identify specific types.
Now conversely, what would we expect if life was created. The diagram on the right shows the “quantized” or “stovepipe” effect predicted by a creation. Once created, there would little or no change over time. We could have extinctions and maybe a full expression of a gene pool, like varieties of dogs or finches, but the structures should stay more or less constant over time.