Fact 1: Biodiversity increases the productivity and stability of ecosystems.

Fact 2: Biodiversity contributes to ecosystem complexity.

Given the two facts above, answer the question "An ecosystem's what increases its productivity and stability" with the following options: 
- elevation
 - complexity
 - Quality of life
 - seasons
 - seasonal changes
 - Animal survival
 - trees
 - Plants growth


 

  complexity       