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 that the most vigorous and adapted males produce a greater number of living beings of the same species and give them a greater chance of survival.
On the other hand, the Species the more they grow in population, they will have the best chance of survival, instead, which are decreasing become rare and tend to extinction, because they are overcome by the modified and improved descendants with the most common species or with more living beings. But no one can predict which groups will prevail until the end, because there are species that have survived despite being a minority, it means that no one knows the end of a species and the survival of the other.
For Darwin the mos...
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..., Darwin also compared with the "artificial selection" which is practicing by pigeon breeders these people choose the best individuals to play. Although there is an important difference: in the process of "natural selection" there is no agent that will perform the process as in the "artificial selection", it will just happens. Darwin finished linking the ideas of Malthus and, much later, Spencer: in a world with limited resources, there is a "struggle for existence" between individuals of different populations of species that inhabit the planet. As part of this "struggle" takes place "survival of the fittest," a process by which individuals that have certain variants that allow them to grow, reproduce and leave as many decendents will be favored. This is how Darwin interpreted the survival of the fittest, but over the time his ideas were perceived in a different way.
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