Firstly, reframing the definition of evolution to suit the answer you want isn't the most scientific apporach to life. But, not withstanding that there is plenty of evidence of the evolution of one species into another, in the form of fossils.
But, it takes thousands of years (which I realise is inconvenient for those that believe the earth was only created a few thousand years ago).
Lets look at the fossil record of the transition from fish to tetrapods for example, which includes the fossil Tiktaalik which has features of both fish and early amphibians. Now, this was around 400 million years ago, which I am sure you will have issue with...