Explanation:
Study of human population - Demography
Number of people per square mile - Population density
Population an area can support - Carrying capacity
Count of an area's population - Census
The terms given are all related to the measures of the population, the number of people living in a particular place. Demography is the study of the human population is particular place. Some tools are used to measure and study population dynamics. This helps for better planning and decision making. Population density is a quantitative metrics which measures the number of people per square mile. The carrying capacity of place describes the population a particular area can support. The head count of a organisms or people in a particular place is called a census.