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The four parts of natural selection are:
1 - Variation: If there is no variation in a population, there aren't any differential adaptability between the individuals in order to be selected.
2 - Fitness: That is the differential survival and capacity to reproduce of the variants.
3 - Inheritance: The traits must be inherited in order to be natural selection by the reproduction of the individuals with higher fitness.
4 - The population must have a high population rate in order to see the results of the changes in the proportions of each variant over time.
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