measure the length and mass of several squirrels determine the genes that control squirrel traits make field observations of squirrels in their natural habitat read articles about the energy and nutrient requirements of squirrels
I gave my students this multiple choice question: What would be the best way to determine the role of squirrels in a forest ecosystem?

Only one answer is correct among these 4 choices:
- measure the length and mass of several squirrels
- determine the genes that control squirrel traits
- make field observations of squirrels in their natural habitat
- read articles about the energy and nutrient requirements of squirrels

Could you tell me which one is correct?

make field observations of squirrels in their natural habitat