Part one of term paper
Evolution, the science of how populations of living organisms change over time in response to their environment, is the central unifying theme in biology today. Evolution was first explored in its semi-modern form in Charles Darwin 's 1859 book, Origin of Species by means of Natural Selection. In this book, Darwin laid out a strong argument f ...

Part two of term paper
... to survive better in their new environments. These modifications were the key to the evolution of new species, and Darwin proposed natural selection or "survival of the fittest" as the vehicle by which that change occurs. Under Natural Selection, some individuals in a population have adaptations that allow them to survive and reproduce more than other individuals. These adaptations become more common in the population because of this higher reproductive success. Over time, the characteristics o ...