The grass would become greener. More birds would move into the fields. The hawks would eat more of the grass. There would be fewer sparrows seen in the fields.
I gave my students this multiple choice question: What will most likely happen to this food chain if a farmer decides to dust a wheat crop with an insecticide? wheat -> insects -> sparrows -> hawks

Only one answer is correct among these 4 choices:
- The grass would become greener.
- More birds would move into the fields.
- The hawks would eat more of the grass.
- There would be fewer sparrows seen in the fields.

Could you tell me which one is correct?

There would be fewer sparrows seen in the fields.