Which of the following is NOT one of the three main properties of a population?

The three main properties of a population typically include size, density, and dispersion.

Size refers to the total number of individuals within a population. It gives insights into the population's stability and potential for growth or decline. Density measures how many individuals are present in a given area, which helps in understanding resource availability and competition among individuals. Dispersion describes the way individuals are spaced within the environment, indicating patterns of distribution that reflect ecological interactions and resource use.

Movement, while an important aspect of ecology, does not constitute a primary property of population structure. It encompasses the range and migration patterns of individuals but is not classified among the fundamental properties that define a population's characteristics. Therefore, identifying movement as not being one of the three main properties highlights its secondary role in understanding population dynamics compared to size, density, and dispersion.