Examlex
Production possibilities frontiers cannot be used to illustrate trade-offs.
Nitrogen Cycle
Movement of nitrogen among the atmosphere, soil, and water, and into and out of food webs.
Calcium Cycle
A geochemical cycle involving the movement and exchange of calcium among the lithosphere, hydrosphere, biosphere, and atmosphere.
Nutrient Cycling
The process of the movement and exchange of organic and inorganic matter back into the production of living matter.
Wastes
Wastes are substances or materials that are discarded after serving their primary purpose or are considered not useful.
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