Please choose the correct answer to the question: Some plant species are more tolerant of acidic soil than others. The tolerant species are favored in areas affected by which consequence of human activity?

Answer1: mixing of pollutants with rain Answer2: erosion of topsoil by clearcutting Answer3: runoff of fertilizer used in farming Answer4: thinning of the atmospheric ozone layer

Answer format: answer1/answer2/answer3/answer4