Question

There are 20 mice in a 5 m^2 field ecosystem. The population density of mice is _____.

Answer 1

you have to divide the total mice (20) by the area of the field (5)
20/ 5 is 4
4 mice per m^2

Answer 2

Population density is = population per unit area
i.e 20/5 m^2

= 4 mice per m^2