No, you forgot what you just asked. You asked how I know this beetle evolved, and that is the evidence that shows it. I’m not saying I have with that explained how the Bombardier beetle’s defense mechanisms evolved.
But we do know the beetle itself shares common descent with all other beetles, and all other insects, and so on. And the nesting hiearchies are how we know that.
So with that in mind, we can look at what the ancestors of the Bombardier beetle were like in order to analyze the evolutionary history of it’s defense mechanisms.
You are using universal common descent by selection and drift as a working hypothesis yet selection and drift are not mentioned.
Whats not been established is selection and drift as innovative mechanisms.
More irrelevant word salad.