For example killing cockroaches makes them harder to kill or killing them with baygon makes them adapt if they’re already dead?
In: Biology
They don’t. If you kill every roach that gets exposed at all, there is no adaptation.
However, if your dose is too low to kill all the roaches, the ones that survive are the ones that are more resistant, and if you spray many generations, but not to the point of actually killing all of them, they’ll get extremely resistant.
Here’s a good demonstration of this process of adaptation:
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