Fact 1: Biodiversity generally increases from the poles to the equator.

Fact 2: Biodiversity contributes to ecosystem complexity.

Given the two facts above, answer the question "Where is ecosystem complexitiy generally least?" with the following options: 
- humans disturb it
 - frontal zones
 - in lakes
 - at the ocean
 - our planet
 - at the poles
 - mouth of rivers
 - at the equator


 

      at the poles   