Well I would call it an example of natural selection. Nothing has changed really, except the proportion of resistant bacteria.
False. There are countless examples of antibiotic resistance arising de novo in an isolated population in which it previously did not exist.
This is so common that it's a frequent experiment for beginning classes in biology -- which is probably why the anti-evolutionists are grossly ignorant of it, they don't seem to have bothered with even the most elementary education on the topic they attempt to pontificate upon.