An insecticide kills many insects, but a few survive. Because of natural selection, which of the following is most likely to happen
1- Eventually the survivors will become resistant to insecticide

2- the survivors will reproduce, and the offspring will be resistant to the insecticide

3- the survivors will reproduce, but the offspring will be killed by another application of the insecticide

4- the survivors will continue to survive for many years beyond their normal lifespan