Corrected entry: The science behind what happens to Paris in this episode is fundamentally flawed. The Doctor states that Tom is "evolving," however the smallest unit of evolution is a population. An individual cannot evolve, only mutate. Also, evolution is not a predestined process as it is apparently portrayed in this episode. It is a random occurrence, and so there is no way to know what humanity will evolve into.
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Correction: This is not a scientific error, but a grammatical one, and since the doctor is a humanized facsimile of its original creator, it is simply a semantic choice of the original programmer. In common usage, mutation and evolution are often interchanged by the user, even if the absolute literal definition is not 100% accurate.
johnrosa