You are presented with the question "What is affected by the average number of individuals per unit of area or volume?" and the following answer choices: 
- goats
 - economy
 - cows
 - animals
 - vegetation
 - mammals
 - bushes
 - wind

Now knowing that population density is the average number of individuals per unit of area or volume and economy is affected by population size and density, choose the best answer.


 

  economy       