Final answer:
Individuals do not evolve as their genes do not change over time. Evolution occurs at the population level, driven by natural selection, genetic drift, and gene flow.
Step-by-step explanation:
Individuals do not evolve because their genes do not change over time. Evolution occurs at the population level, where the genetic composition of a population changes over generations. Evolution is driven by factors such as natural selection, genetic drift, and gene flow, which act on populations as a whole. For example, if a certain trait provides a reproductive advantage, individuals with that trait are more likely to survive and pass on their genes to the next generation, causing a change in the frequency of that trait in the population over time.