Have bacteria evolved antibiotic resistance? Or did they already have a mechanism for it?

Antibiotic resistance is often presented as evidence of evolution in action. But is it really? Could it be bacteria responding to stimulus rather than

Antibiotic resistance is often presented as evidence of evolution in action. But is it really? Could it be bacteria responding to stimulus rather than mutating?

or:Antibiotic resistance is often presented as evidence of evolution in action. But is it really? Could it be bacteria responding to stimulus rather than mutating?


or:Nobody has ever actually witnessed any evidence of actual evolution. If you ask about an example they tell you how stupid you are and that real evolution takes ages and ages. But then they tell that there is evidence of evolution all over the place. When they show you some evidence, it turns out to be a hoax. It gets to where you wonder who let these idiots into the building.

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