B because because because because
<h2>Major: Environmental Science</h2><h2>When coal and oil are burned, they form acids that fall to the earth as rain. Acid rain can do a lot of damage, such as killing off living things in lakes. Scientists figured out, however, that lakes on limestone rock were less affected than others. Why? Limestone weakens acid. So as a short-term solution, scientists added lime to lakes where it doesn't occur naturally.</h2>
<h2>No single science was enough to come up with this solution -- it took experts in biology, chemistry, geology, and other sciences. If you major in environmental science, you'll learn to use the ideas and methods of a number of biological and physical sciences to tackle some of the world’s most pressing problems</h2>
Answer and Explanation:
Historical and current events shape society and promote human evolution in the social, economic and scientific fields. When this happens, it is necessary to create new political structures that reorganize the society that was modified by the events, establishing limits and freedom that will allow a life with the minimum of quality. Since the whole world is interconnected by numerous factors, the transformation of the political structure of a region, promotes a reorganization in the political structure of several other territories.
