Final answer:
The three degrees of distribution density in populations are random, clumped, and uniform, reflecting different biological and ecological traits of species.
Step-by-step explanation:
The three degrees of distribution density refers to how individuals within a population are dispersed across their habitat. These distributions include random, clumped (or aggregated), and uniform (or even) distribution patterns. Random distribution happens when individuals are spread without a discernible pattern, clumped distribution occurs when individuals aggregate in certain areas, and uniform distribution is when individuals are evenly spaced throughout the environment. These patterns reflect significant aspects of the species' biology and are influenced by factors such as resource availability, social behavior, and territoriality. Therefore, the correct answer for the three degrees of distribution density is: extensive, concentrated, and selective.