Question

__________ refers to the number of organisms per unit of an area.

Answer 1

In ecology, a population consists of all the organisms of a given species that live in a particular area. ... Two important measures of a population are population size, the number of individuals, and population density, the number of individuals per unit area or volume.

Answer 2

Population density refers to the number of organisms per unit of an area.

1. It is a measurement of a given population in a particular area or region.
2. It helps in finding out the number of organisms per unit in a particular area.
3. It is a tool that is applicable mostly for humans but sometimes for species. For example - keeping track of tigers is very much needed as they are endangered species.

• The population density of the United Kingdom is 269/km² compared to Malta that is 1260/km².