Fact 1: Population size influences the chances of a species surviving.

Fact 2: Estuaries are critical for the survival of many species.

Given the two facts above, answer the question "Estuaries allow for appropriate what for a species" with the following options: 
- sunlight
 - weather
 - reusing materials
 - wind
 - population size
 - Quality of life
 - root growth
 - recovery


 

     population size    