A trail built by cutting down trees A river eroding away the riverbank A bird nest made of dead branches A group of butterflies landing on flowers
I gave my students this multiple choice question: A student is hiking through a forest taking pictures for science class. Which picture would most likely be used as an example of human impact on Earth?

Only one answer is correct among these 4 choices:
- A trail built by cutting down trees
- A river eroding away the riverbank
- A bird nest made of dead branches
- A group of butterflies landing on flowers

Could you tell me which one is correct?

A trail built by cutting down trees