system
A chat on subreddit /r/NoStupidQuestions
human
Proving is something you can only do in maths, you can not prove evolution, relativity or anything in physics. 

You can instead come up with an alternative theory and you can construct experiments that show that one of them has to be false, then that new theory is going to be the new best guess.
gpt
When people say evolution is proven, they are talking in non-scientific terms.  There isn't just evidence, we exploit evolution to our advantage, e.g: selective breeding. If evolution wasn't real, we wouldn't be able to use it.