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Genetic Variation: In a population there will always be differences in the organisms, ranging from how big they are and what traits they carry, even their ability to attract a mate is a variation among most species.
Overpopulation: When there is too many of the same organisms then it is almost certain that most will die due to the lack of food or to being a predators favorite snack, and since there are so many means more food for others,
Differential Survival: In a population there will be different traits but in those traits could be traits to assist in survival, if a species mutates and gains a special trait for survival then it will not only have a better chance of mating because females want the strongest but the trait will grow more useful as the generations come, this can be from something as camouflage to a higher tolerance to something dangerous.
Gene pool: When the beneficial traits are passed on then this allows for the far future generations to all have the same trait that allows for easier survival, an example could be a bear having bigger claws for an easier chance at catching fish and as the generations go then it will come to a point where all bears have bigger claws.
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