Today everything is the product of evolution. From apes to Homo sapiens, humans have evolved from crawling on all fours to walking on two flat feet. Mammals have gone from small rodents to different categories of cats, horses, dogs, elephants, dolphins and many others. However, there would be no evolution without natural selection; it's what sets everything apart and gives unique geniuses purpose. Without this, species would not have the ability to adapt and thrive in the world's ever-changing climates. Polar bears have thick coats that keep them warm in the Arctic, cacti have spines to protect them from harsh, desert environments, and dolphins use sonar to communicate and detect objects underwater. However, traits that help some species survive can, in turn, hurt others. For example, humans have been fighting pathogenic bacteria for hundreds of years. When antibiotics arrived, it seemed that humans were winning the war against disease. However, recently, harmful bacteria are making a comeback and are slowly but surely becoming resistant to the many antibiotics available today. Through evolution and natural selection, bacteria have mutated and multiplied so rapidly that scientists can hardly keep up. The world may soon be facing another pandemic, and past ones have left more than a small mark on the human population. Although evolution is impossible to stop, humans have also played a role in accelerating the process of development of antibiotic-resistant bacteria; From misdiagnosing diseases to disposing of old antibiotics in the trash, people around the world play a role in winning or losing this battle against bacteria. Antibiotics are essential for fighting diseases caused by pathogenic bacteria....... middle of article ......gy 11.1 (2010): 2-12. AcademicSearchPremier. Network. November 21, 2011.Kaufman, Gerri. "Antibiotics: mode of action and mechanisms of resistance". Arts and Science 25.42 (2011): 49-55. CINAHL Plus with full text. Network. November 9, 2011. Kropinski, Andrew. “Phage Therapy: Everything Old Is New Again.” The Canadian Journal of Infectious Diseases & Medical Microbiology 17.5 (2006): 297-303. Pub Med. Network. November 22, 2011. O'Connor, E. M. and R. F. Shand. "Halocins and sulfolobicins: the emerging story of archaeal proteins and peptide antibiotics". Journal of Industrial Microbiology and Biotechnology 28.1 (2002): 23-30. Premier of academic research. Network. November 21, 2011. United States. Government Accountability Office. “Data gaps on antibiotic resistance will remain even as HHS has taken steps to improve monitoring.” GAO.gov.Government Accountability Office, June 1, 2011. Web. November 9. 2011.