Charles Darwin Natural Selection
Summary

Charles Darwin is one of the greatest English naturalists of the nineteenth century. Darwin is well know all around the world for the great work he made on the species evolution, Darwin’s theory revolutionized biology. Darwinian Theory was imposed in scientist community and also in the public opinion, and Natural selection theory is, now, considered as the base of the modern evolution theory. Darwin was, certainly, influenced by his grandfather, Erasmus Darwin, a great horticulturist. Darwin’s natural selection theory claims that every variation between generations, in the same species, is due to an evolutionary system to preserve the species from extinction. Each variation, no matter how small it could be, protects the species from natural selection. The particularity develop through generations, permit a better adaptation of the environment as well as the survival of those species.
By using an example of a country undergoing some changes, which could be physical, link with the climate, Darwin demonstrate that the population will be affect by the changes occurring in this country. Darwin explain that population undergoing changes, and extinction of some species, could also affect a lot of other species. In fact, the disappearance of a species must disorder the life balance in this particular country. The immigration of new specie, could, also alter old species. But the space left extinct species will permit a modification of the native species for a better adaptation, or will be replacing by emigrant specie.
By increasing profitable variations, natural selection cannot occur. Darwin supposed that species does not need special events such as physical change, climate change or arrival of a new specie for local species modifications. The balance of the forces occurring in the nature betweens species could be alter by modifications and each modification could give an advantage, not