Scientific Debate: Why I assert that Darwin's theory of evolution is false

[Heywood]

I hope that we can all agree that evolution and adaptation do exist in nature. All living creatures (animals and plants alike) can adapt to conditions over time. My argument is that Darwin's theory of evolution cannot be true because there has never been scientific proof of any one species adapting over time to be categorized as another species. Bacteria evolves into bacteria, fish evolve into fish, primates evolve into primates, etc.

I haven't read the entire thread yet, so excuse me if this has been mentioned already. What about ring species?

http://en.wikipedia.org/wiki/Ring_species

Ring species provide important evidence of evolution in that they illustrate what happens over time as populations genetically diverge, and are special because they represent in living populations what normally happens over time between long deceased ancestor populations and living populations, in which the intermediates have become extinct.

If speciation can occur over distance....why can't it occur over time?