The United States will need to design its overseas military presence. for the coming decades in a way that responds to the changing inter-. national security environment and that takes into account a view on. how the United States should see its future role in the world.
metabolism. 1  Biology, Physiology. the sum of the physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available. 2  any basic process of organic functioning or operating: changes in the country's economic metabolism.
Energy can neither be created nor destroyed. One usable form of energy cannot be completely converted into another usable form. Metabolism is the sum of all chemical reactions occurring inside a living cell. Every reaction in a cell requires a specific enzyme.