Part 1 of Essay
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 ....

Part 2 of Essay
.... and reproduce more than other individuals. These adaptations become more common in the population because of this higher reproductive success. Over time, the characteristics of the population as a whole can change, sometimes even resulting in the formation of a new species. Humans have survived for thousands of years and will most like survive thousands of more. Throughout the history of the Huminoid species man has evolved from Homo Erectus to what we today call Homo Sapiens, or what we know today as modern ....