For Darwin, the "natural selection" or "survival of the fittest" it is what preserves the difference and individual variation of all living things that leads to the improvement in their living conditions and to destroy everything that harms them. However, for this to be carried out, it must pass certain changes or modifications to the living being throughout history, which will make it stronger and more adaptable to any environment. In addition, the species that are better suited to a climate or environment, transmit these qualities to their decendents, which will help them have a better future. Similarly, sexual selection ensures …show more content…
It was Herbert Spencer a sociologist and philosopher, who was excited about reading Darwin's work. The philosopher, who lived between 1820 and 1903, used the phrase as synonymous with the process of natural selection in his book Principles of Biology in 1864, but what it meant the idea of "survival of the fittest"? For Darwin, did not mean that the most trained or more energetic species were to win the race for life. It did not mean that the fittest species were going to survive for being the strongest or the most aggressive with others. The fittest, from the perspective of the English naturalist, were the individuals who have certain characteristics, called "favorable variations" that allow them to survive in one determined environment also reproduce and leave a larger number of decendents. In this way the process of natural selection