Which of the following is a secondary pollutant? (5 points) carbon dioxide
carbon monoxide
sulfur dioxide
nitric oxide
nitrogen dioxide

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing