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What is a population?

In Biology population is a set of individuals of the same species living in a given place and in a given time.

What is population density?

Population density is the relation between the number of individuals of a population and the area or volume they occupy. For example, in 2001 the human population density of the United States (according to the World Bank) was 29,71 inhabitants per square kilometer and China had a population density of 135,41 humans per square kilometer.

What is population growth rate?

Population growth rate (PGR) is the percent variation between the number of individuals in a population in two different times. Therefore the population growth rate can be positive or negative.