There is no way to prove the theory of evolution.
All they can do is look at what is, and then make up speculations as to how this all came about.
Remember, Darwin's theory of evolution has already been dis-proven. Darwin made a lot of assumptions that turned out to be untrue. Darwin talked about spontaneous generation, and he based this theory on his observations. That is, when you hang a piece of meat out, it will spontaneously generate flies. But what he failed to realize is that other flies had already laid EGGS on the carcass, and then the eggs hatched.
Darwin also did not know anything about DNA. And he knew nothing of irreducible complexity of the single cell.
And another thing, as we learn more about the most simple things, like single cells, we find they are far more complex than we ever imagined. And we have the problem of irreducible complexity. That is, when you start taking away some of the contents of a single cell, it doesn't work anymore. Thus there is no way this could "evolve." It's like, if half of your car engine was gone, including the fuel injection system for example, your car engine would not run. Darwin did not know anything about DNA when he developed his theory, and he did not know anything about the irreducible complexity of a single cell.
And another thing, how would you explain MALE and FEMALE. How could two same but different organisms just come into existence out of nothing. And at the same time? And why do we need males and females? Why would this evolve this way? It doesn't make sense. Clearly, this was someone's DESIGN.
When I study the human body, I marvel at its design. You can study each joint, and see how carefully it was designed. Our bodies are chemical laboratories, and each organ is synthesizing chemicals needed to control metabolism and blood flow. For example, you can study one function, like clotting, and learn about all the complex changes that must occur to make blood clot. Look at how our eyeballs are designed for vision, and all the delicate muscles that allow our eyes to focus and see in light and dark. Clearly, we were carefully designed.