IntroductionMany scientists in the past, such as Aristotle and Plato, believed that there were no changes in populations; However, other scientists, such as Darwin and Wallace, stood up and argued that species inherit hereditary traits from common ancestors and that environmental forces drive out certain hereditary traits that make the species better suited to survive or be more “adapted” to this environment. Therefore, species change over time and they were able to support their theory by showing that evolution does indeed occur. Their theory included four fundamental mechanisms of evolution: mutation, migration, genetic drift and natural selection. Natural selection is the progressive process by which heritable traits that make an organism's survival and reproduction more likely increase, while there is a decline in those that possess these beneficial heritable traits (natural selection). For example, there is a decrease in rainfall which causes drought in the finches' environment. The seeds in the finches' environment would not be soft enough for finches with smaller, weaker beaks to break; therefore, they cannot compete with larger, stronger beaked finches for food. Larger, stronger beaked finches have a hereditary trait that helps them survive and reproduce better than others in that particular environment, which classifies them under natural selection (Freeman, 2002). On the other hand, artificial selection is the exact opposite of natural selection. . Artificial selection occurs when humans manually modify or manipulate certain desirable traits that will appear in offspring (artificial selection). Charles Darwin formed this term when he selectively bred animals such as pigeons, cats... middle of paper ... to keep the experiment consistent. We would make sure everyone remembers and does what they need to do. Additionally, we would do more than two generations, because the more generations we have, the better the results would be, which would help us clearly see whether our data supports or refutes our hypothesis. References Freeman, Scott. Biological sciences. 4th. University of Washington: Pearson Education, 2002. Mifflin, Houghton. “Scientific definition of artificial selection.” Your dictionary. Houghton Mifflin Harcourt, 2010. The web. May 10, 2014. Mifflin, Houghton. “Scientific definition of natural selection.” Your dictionary. Houghton Mifflin Harcourt, 2010. The web. May 10, 2014. Zacherl, Danielle. “Biology 171, evolution and biodiversity.” 2007 Annual Meeting of the National Association for Research in Science Education, New Orleans LA. (2007):n. page. Print.