divergent evolution natural selection bottleneck effect selective breeding
I gave my students this multiple choice question: Repeated pesticide use on an insect population can result in some of the insects becoming resistant to that pesticide over time. Which process is responsible for the pesticides no longer being effective on the insects?

Only one answer is correct among these 4 choices:
- divergent evolution
- natural selection
- bottleneck effect
- selective breeding

Could you tell me which one is correct?

natural selection