examining the number of plants in a given area examining the type of animals that eat the plant examining the type of seeds the plant produces examining the fossil record of the plant
I gave my students this multiple choice question: Which of these would help determine the changes in a plant species over geologic time?

Only one answer is correct among these 4 choices:
- examining the number of plants in a given area
- examining the type of animals that eat the plant
- examining the type of seeds the plant produces
- examining the fossil record of the plant

Could you tell me which one is correct?

examining the fossil record of the plant