Can't tell if you're kidding or not.
And I'd ask you to prove that changes did actually take place... But I already know you can't. Lol.
If you ask me to prove they didn't, my answer:
I can't.
The only evidence that they didn't is that there are no half-"evolved" species, and there are 0 beneficial mutations. If there were beneficial mutations, there is virtually no chance that that mutation would get passed on to the mutated being's offspring, resulting in the loss of that single beneficial mutation.
:|..