Population characteristics vary from place to place and over time because the density of living species varies depending on time and place. Time involves changing seasons and the amount of solar radiation, the last factor is also applicable to place. Regarding all living societies, the abundance of resources like food, water, and free space affect population characteristics. For example, if there is a lot of space and nutrients, the population will grow and spread. limited space but abundance of food will result in increasing size of the population until certain limit.