What is considered an economic service of freshwater systems? 

A)  nutrient cycling 
B)  habitat for aquatic species 
C)  groundwater recharge 
D)  drinking water

Freshwater Systems

Ecosystems that are comprised of bodies of water like rivers, lakes, and wetlands, which have low salt concentration.

Economic Service

Activities or functions that have monetary value to individuals or society at large, such as pollination, clean water, and raw material provision.

Nutrient Cycling

The movement and exchange of organic and inorganic matter back into the production of living matter through processes such as decomposition.