How many of the same types of organisms live in that area .
The average number of people or things in an area can vary based on the size and population density of the area. It is calculated by dividing the total number of people or things by the area's size. Population density is often used to determine this average in areas with people.
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Population density
The number of individuals in the population is the population's size. If a population is small enough you will be able to determine the size by counting the individuals.
The least invasive way to determine population size is to use the sampling technique. If you are able to determine how many subjects are in a few small areas, you may be able to estimate how many are in the entire area. An example would be, if there are 10 people living in one apartment building, and there are a total of 50 apartment buildings in the complex, an estimate of your population size would be 500, assuming there are no empty apartments.
A census.
Population size refers to the total number of individuals in a specific area, while population density is the number of individuals per unit area. Population size gives the total count of individuals, while population density provides a measure of how crowded or sparse the population is in a given area.
Relative population size is the size of an area's population as it compares to similar areas' populations. For example, the relative population size of a country would be what rank it had compared to the population of other countries.
The carrying capacity of a population.
Townsville, in area and size not by population, that's what really counts area and size.
Alaska is the state with the largest area and the largest population density (That is, Population relative to size).
On a graph of population growth the size of the population when the growth rate decreases to zero represents an area's carrying capacity.