Population density is the average number of individuals per unit of area or volume, and density is the population divided by the area. Given these facts, what is the average number of individuals per unit of area or volume among the following options:
- population divided by class
 - population divided by area
 - solid, liquid, gas
 - biological diversity
 - competing for resources
 - population divided by income
 - population divided by wealth
 - Something that makes plants green


 

  population divided by area       