gre考试阅读真题解析(A)_GRE阅读

gre考试阅读真题解析(A)

　　 They decrease the likelihood that employers will offer more protection to women workers than that which is absolutely required by law.

　　 They increase the tendency of employers to deny health insurance and disability plans to women workers.

　　 They have little impact of any kind on women workers, since typically very few women are employed in those classes of jobs covered by the laws.

　　While it is true that living organisms are profoundly affected by their environment, it is equally important to remember that many organisms are also capable of altering their habitat significantly, sometimes limiting their own growth. The influence of the biological component of an ecosystem is often greater in fresh waters that in marine or terrestrial systems, because of the small size of many freshwater bodies. Many of the important effects of organisms are related to their physiology, especially growth and respiration. By their growth many species can deplete essential nutrients within the system, thus limiting their own growth or that of other species. Lund has demonstrated that in Lake Windermere the alga Asterionella is unable to grow in conditions that it itself has created. Once a year, in the spring, this plant starts to grow rapidly in the lake, using up so much silica from the water that by late spring there is no longer enough to maintain its own growth. The population decreases dramatically as a result.

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