It's becoming clear that people who do not accept evolution as a reality are people who do not have any understanding of the process by which it occurs.

You keep saying, "Organisms don't just change into other organisms."

And you're right. They don't. That is not how evolution works.

When an organism undergoes a genetic mutation (this happens randomly and it happens all the time) that organism is by definition genetically different than its predecessors. If said mutation proves to be advantageous to that organism's survival, then it is able to outlive its predecessors and pass along its mutation to its offspring. Thus a new genetic type emerges and spreads. Now all these offspring which have retained this mutation can go and procreate and spread the gene even further. The longer this goes on, the more pronounced and defined the mutation becomes until it is no longer considered a mutation and can be regarded as a new species. This is in fact necessary to prevent inbreeding.

You must realize that this has been going on at the most basic cellular level since the beginning of carbon based life. It is why we have nucleic DNA and mitochondrial DNA. Originally a mitochondria was a seperate cell with a life of its own. It was eventually incorporated into eukaryotic cells which developed a symbiotic relationship with the mitochondria and allowed them to benefit from mitochondrial energy production. To this day we still have mitochondrial DNA separate from our cell nuclei. There is no way to explain this beyond genetic mutation and evolution,