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Organization orderly structure of cells in an organism; a characteristic of all living things cellular composition The characteristic of life that states that living matter is always compartmentalized into one or more cells. metabolism the combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes anabolism The process of bulidng complex structures out of simpler precursors, e.g. synthesizing protiens from amino acids. catabolism Process of breaking down complex materials (foods) to form simpler substances and release energy excretion Required for metabolism ;elimination of wastes from the body (urine, carbon dioxide, sweat) stimuli a change in an organism's environment that affects the activity of the organism(Ex:Lights,sounds,taste,chemical, gravity,or darkness) homeostasis a tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level development all of the changes that take place during the life of an organism; a characteristic of all living things. differentiation the process in which the structure and function of the parts of an organism change to enable specialization of those parts evolution generation-to-generation change in the proportion of different inherited genes in a population that account for all of the changes that have transformed life over an immense time mutations change in a DNA sequence that affects genetic information legally dead No brain waves for 24 hours, no reflexes, no respiration, no heartbeat without life support