But species just dont totally change classifications.
A species can make radical changes to its genetic make up, but its still the same species.

I am not saying Darwin's Theory has been proven, because its far from that;
but evolution as a scientific process has been proven.
Because they define it as an organism that has mutated because of its surroundings, and not random mutation.

i.e. Monkey's might have evolved to humans, but they are still mammals, they dont change to amphibians.