You are presented with the question "What generally increases from the poles to the equator?" and the following answer choices: 
- kinetic energy
 - Energy.
 - warmth
 - voltage
 - sun's heat
 - temperature
 - complexity
 - sunlight

Now knowing that biodiversity generally increases from the poles to the equator and biodiversity and ecosystems are complex systems, choose the best answer.


 

       complexity  