Evolution, to sane people, by the definition we apply to it, happens. If you deny that evolution happens you are in the same camp as flat-earthers or chocolate teapotters. That's what I mean when I say it's true. The theory of evolution is derived from the evidence that tells us that evolution is true. There is still plenty more to explain and argue about, but the general thrust of evolution in action can never be overturned. It is the theory that is the explanation. It's one of the best explanations we have for any natural phenomenon, but it is just the explanation.