is the process by which individuals with advantageous are more likely to survive and reproduce in their This process leads to the gradual of populations over time , as favorable traits become more common . The variations in traits within a population are due to and environmental factors . Individuals with traits that increase their are more likely to pass on their genes to the next generation , resulting in the accumulation of favorable traits within the population . This process ultimately leads to the of populations to their specific environments , as organisms with traits that are well - suited to their surroundings have a higher chance of and passing on their genes . Natural selection Environment Evolution Genetic variation Fitness Adaptation Survival Traits
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