finding the nest of a bald eagle tracking the footprints of a wolf analyzing the pollination of a sunflower discovering a fossil of a seashell in a wooded area
I gave my students this multiple choice question: Which would best aid a scientist in discovering how Earth may have changed over time?

Only one answer is correct among these 4 choices:
- finding the nest of a bald eagle
- tracking the footprints of a wolf
- analyzing the pollination of a sunflower
- discovering a fossil of a seashell in a wooded area

Could you tell me which one is correct?

discovering a fossil of a seashell in a wooded area