Charles Darwin (1809-1882) published "the origin of species" in 1859. This was a book to explain his theory of human evolution. He designed a concept of "natural selection" which stated that behavioural and physical changes to a species happened randomly, this means that evolution happened randomly through irregular occurrences in the cycle of life. Meaning that a random change could affect evolution. Some changes would help the species and some wouldn't help, these were called maladaptive. The theory worked on the basis that maladaptive changes would not be carried through evolution, because the organism would die as it was not as strong for example as the rest in its specie. This would mean that a gene that made that particular organism less likely to survive would die with that organism and would not be passed as a characteristic onto future generations.

Darwin also enforced the importance of...