How successful an individual is at passing on its genes to the next generation is known as:

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Fitness is the measure of an individual's ability to produce viable offspring that can survive and reproduce. It is a key concept in the theory of evolution as it determines which traits or characteristics are most advantageous for survival and reproduction, and thus more likely to be passed down to future generations. Microevolution refers to small-scale changes in a population's gene pool, while adaptation refers to the process of natural selection that leads to the development of traits that enable an organism to survive and reproduce in its environment. Sexual selection is a specific form of natural selection that involves competition for mating opportunities and the development of secondary sexual characteristics. While sexual selection can impact an individual's fitness, it is not synonymous with overall reproductive success.

How Successful an Individual Is at Passing on Its Genes