In Afghanistan, the US-led international force still occupies more than 450 bases. In total, the US military has some form of troop presence in approximately 150 foreign countries, not to mention 11 aircraft carrier task forcesâessentially floating basesâand a significant, and growing, military presence in space.
Metabolism is the set of chemical reactions that occur in living organisms in order to maintain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments.
Metabolism, Human. Metabolism means the sum of all chemical changes in a cell or the body of an organism. It has two subdivisions: catabolism and anabolism. Catabolism (from the Greek cata, meaning down) consists of all those reactions in which large molecules are broken down into smaller ones, with a release of energy from their chemical bonds.