What is individuals near the center of the curve have higher fitness than individuals at either end?

This concept refers to stabilizing selection, a type of natural selection where individuals with traits near the average have higher fitness compared to those with extreme traits. In this scenario, individuals at the center of the curve—representing the average phenotype—are more likely to survive and reproduce, as they are better adapted to the environment. This leads to reduced variability in the population, as extreme traits are selected against. Overall, stabilizing selection promotes the maintenance of common traits while filtering out less advantageous extremes.