Social and economic characteristics also affect alcohol consumption in complex ways.

CNN: More Americans drinking (alcohol)

Ants, bees and wasps form complex communities but do not seem to rely on facial characteristics for their communication.

ECONOMIST: Facial characteristics

Groundwater response to global changes is a complex function that depends on climate change and variability, topography, aquifer characteristics, vegetation dynamics, and human activities.

UNESCO: Climate Change Effects on Groundwater Resources: A Global Synthesis of Findings and Recommendations | United Nations Educational, Scientific and Cultural Organization