How does natural selection affect the competition between two organisms?

Natural selection influences competition between two organisms by favoring traits that enhance survival and reproductive success in a given environment. When two species compete for the same resources, individuals with advantageous adaptations are more likely to thrive and reproduce, passing those traits to future generations. This process can lead to resource partitioning, where species evolve to exploit different resources, or competitive exclusion, where one species outcompetes the other, ultimately affecting population dynamics and ecosystem balance.