frogs in a pond ecosystem fish in an ocean ecosystem bears in a tundra ecosystem lions in a grassland ecosystem
I gave my students this multiple choice question: Human interaction with the environment has led to increasing amounts of acid rain. Which population have humans adversely affected the most by contributing to the production of acid rain?

Only one answer is correct among these 4 choices:
- frogs in a pond ecosystem
- fish in an ocean ecosystem
- bears in a tundra ecosystem
- lions in a grassland ecosystem

Could you tell me which one is correct?

frogs in a pond ecosystem