a footprint in a rock a seashell under water a leaf in a mudpuddle a bone on top of a sand pile
I gave my students this multiple choice question: Scientists study fossils to learn about extinct plants and animals. Which of these is the best example of a fossil?

Only one answer is correct among these 4 choices:
- a footprint in a rock
- a seashell under water
- a leaf in a mudpuddle
- a bone on top of a sand pile

Could you tell me which one is correct?

a footprint in a rock