Life Functions- Keys to “Living” Nutrition – includes the activity of an organism by which it obtains materials (for structure) and energy (for life activities) from its environment and processes them for its use. Transport – involves the absorption (taking in) and distribution (circulation) of materials by an organism Respiration - includes those processes which provide the energy (through the conversion of stored energy in food) necessary for the maintenance of life Functions. Excretion – involves the removal from the organism of waste products manufactured by the organism. Synthesis – involves those chemical activities by which large molecules or structures are built from smaller ones. Regulation – involves the control and coordination of the various activities of an organism through responses to change both around and within the organism. Growth – involves an increase in cell size and/or cell numbers. This process utilizes the products of synthesis. Reproduction – involves the production of a new individual from preexisting ones. The reproduction of cells is also responsible for the growth of an organism and the repair of tissue. While the individual’s survival is not dependent on reproduction, species survival is dependent upon the reproduction of individuals.