Human evolution essay is a very important topic. To write really good essay on revolution, you should carefully check all the available information, in order to write really good theory revolution essay. Currently, the reality of evolution, according to Wikipedia, is no longer questioned by none of serious scientists, though there are several competing theories, each of which offers its own version of events. When discussing the history of life on Earth, we must consider two stages, each of which was caused by two different principles. At the first stage, the processes of chemical evolution in the ancient land have led to the formation of the first living cell from inorganic materials. In the second stage, the descendants of living cells have evolved in different directions, causing the diversity of life on the planet, which we are witnessing today. This stage of development is determined by the principle of natural selection.
After the appearance of the first organism, able to reproduction of another living organism, the further changes were guided by natural selection. Most people, using the term evolution, mean natural selection. The idea of natural selection was brought by the English naturalist Charles Darwin, who published his monumental work On the Origin of Species by Means of Natural Selection or the Preservation of Favored Races in the Struggle for Life, in 1859.
The idea of natural selection, which also came to the mind of Alfred Russel Wallace, was based on two assumptions: 1) representatives of any type are different from each other in something, 2) there is always competition for resources. The first of these postulates is obvious to anyone who watched any population (including human population). Some representatives are larger, others run faster, the coloring of others allows them to remain invisible in the background environment. The second postulate reflects the unfortunate fact of life in the natural world. Significantly more organisms are born than survive, and thus, there is a constant competition for resources.
Together, these postulates lead to an interesting conclusion. If some individuals have a feature that allows them to successfully compete in a particular environment - for example, well-developed musculature of our predators allowed them to hunt. Consequently, they had a greater chance to survive up to adulthood and leave the offspring. As a result, their offspring are likely to inherit this feature. In modern terminology, we say that individuals with a high probability will give the genes for a quick run offspring. On the other hand, the probability of bad runners to survive and reproduce is so low, that their genes can not be transferred to the next generation. Thus, a sign that increases the likelihood of survival, will eventually be spread throughout the population.
This process was called a natural selection by Wallace and Darwin. Darwin found it similar to the artificial selection. People use artificial selection to produce plants and animals with desirable traits, selecting for this matter only mature specimens and allowing them for the crossing. If people can do it, Darwin reasoned, why nature could not? For the occurrence of species diversity that we observe in the world today, improved survival of individuals with adaptive traits in successive generations and over a long period of time is more than enough.
The process of evolution is extremely serious and important for the science. We have all the reasons to rely on the Darwin’s theory, however, we do not know anything for sure. Consequently, we have to be opened for new opinions, in order for self development and the development of the society as a whole.