【正确答案】The two graphs here indicate the relation between the population growth and species extinction in the United States.From 1800 to 1980, the population increased quickly to 250, 000, 000 and there were 70 extinct species. The reasons for this phenomenon are as follows. 　　First, many people came to live where these animals used to be. As more space was needed for housing and more land for growing crops, the area for the animals was greatly reduced. Second, the environment has been badly polluted by the fast development of industry. Some species could no longer live in such surroundings. Third, some people hunted valuable animals for money, and these species became extinct quickly. 　　My suggestion is that a law should be made by the government to protect wildlife. And people should be educated to love animals, and protect the environment. More land should be reserved for wildlife. In this way, all the species and man could coexist in this world.