Question

Which situation is a result of human activities A. Decay of leaves in a forest adds to soil fertility B. Acid rain in an area kills fish in a lake C. Ecological succession following volcanic activity reestablishes an ecosystem. D. Natural selection on an island changes gene frequencies

Answer 1

acid rain. While acid rain IS a naturally occurring event without human activities, acid rain becomes a much greater problem because of human activities (releasing pollutants as a by-product of manufacturing/industry