an increase in a food source more frog breeding grounds native wetlands preservation poisons dissolved in the water
I gave my students this multiple choice question: The mountain chorus frog is an endangered species in Maryland. In addition to the loss of habitat, what most likely caused this frog population to decline?

Only one answer is correct among these 4 choices:
- an increase in a food source
- more frog breeding grounds
- native wetlands preservation
- poisons dissolved in the water

Could you tell me which one is correct?

poisons dissolved in the water