To make it a bit clearer, it is not usual practice to have one experiment prove an entire scientific theory. The theory of evolution is comprised of thousands of different bits of science from differing areas. There is paleontology and the fossil record, comprised of thousands upon thousands of fossils, observations and tests. There is genetic evidence of the common ancestry organisms at a molecular level. We can look at two organisms and not only see what parts of their DNA are the same, but describe how closely related they are via ancestry based on their sequence morphology. There are direct observations of evolution in action at the microbial level, the classic go to example being the evolution of a lab strain of E. coli evolving to use extraneous citrate as a metabolite.

The only minor sticking point is that because of the nature of evolution, its impossible to give a fully 100% expermental proof of a bacteria evolving into a monkey, because its simply not possible given the time frames required. Some people latch on to this as somehow being "proof" that the theory of evolution is incomplete and should be disregarded as such, which is really quite absurd.