If natural selection is a natural process that results in the survival and reproductive success of individuals or groups best adjusted to their environment and that leads to the perpetuation of genetic qualities....
Even the most simplest of living organisms contain a biological mechanism that can cause it to change and adapt and to pass on its traits to its descendants, but this should not be confused with the theory of human evolution which purports to show that human beings evolved from (a) non-human specie(s) into the races of mankind walking the earth at this time.