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Both Social Security and Medicare are pay-as-you-go programs.This means that:
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.
Groundwater Recharge
The process by which external water is added to an aquifer, replenishing the groundwater supply.
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