Identify the process most likely responsible for a mosquito initially becoming resistant to deet.

You dont have options so Ill tell you what I know, animals and bugs become immune to things over time for their survival, the good gene is more likely to be passed on and the bugs with the bad gene are going to be the ones that die off. This process is called natural selection. But there is another thing too, over time scientists have created artificial selection, where you choose desirable traits for a living thing. Such as color, size, flavor, resistance to pests, etc.