question: poaching:species extinction
choices.label: A B C D
choices.text: harvesting:soil erosion ozone layer:climate change forest:soil erosion acid rain:water pollution
explanation: "poaching" leads to "species extinction", and "poaching" is a verb. "harvesting" leads to "soil erosion", and "harvesting" is a verb. the destruction of the "ozone layer" will lead to "climate change", and "ozone layer" is a noun. the reduction of "forest" will lead to "soil erosion", and "forest" is a noun. "acid rain" will cause "water pollution", and "acid rain" is a noun.
relation: poaching species extinction R5.1
relation: harvesting soil erosion R5.1
relation: ozone layer climate change R5.1
relation: forest soil erosion R5.1
relation: acid rain water pollution R5.1