You are presented with the question "Estuaries allow for appropriate what for a species" and the following answer choices: 
- sunlight
 - weather
 - reusing materials
 - wind
 - population size
 - Quality of life
 - root growth
 - recovery

Now knowing that population size influences the chances of a species surviving and estuaries are critical for the survival of many species, choose the best answer.


 

     population size    