In the ongoing conflict between science and young Earth creationism, evolution is usually a main point of contention. The idea that all life on Earth evolved from a common ancestor is a major problem for young Earth creationists.
As a geologist, though, I think that the rocks beneath our feet offer even better arguments against young Earth creationism. For the young Earth creationist model
doesn’t square with what you can see for yourself. And this has been known since before Darwin wrote a word about evolution.