So far, then, we can sum up Darwin’s theory of evolution in a few sentences.’ ‘Go ahead!’ ‘We can say that the “raw material” behind the evolution of life on earth was the continual variation of individuals within the same species, plus the large number of progeny, which meant that only a fraction of them survived. The actual “mechanism,” or driving force, behind evolution was thus the natural selection in the struggle for survival. This selection ensured that the strongest, or the “fittest,” survived.’
