Colors can be measured and quantified in various ways; indeed, a person's perception of colors is a subjective process whereby the brain responds to the stimuli that are produced when incoming light reacts with the several types of cone cells in the eye.
unit of service. unit of service. any individual, family, aggregate, organization, or community given nursing care. The level at which service is delivered varies with the particular unit entity.
A service dog waiting for its owner in a banking office. A service dog is a type of assistance dog specifically trained to help people who have disabilities, such as visual impairment, hearing impairments, mental illnesses (such as posttraumatic stress disorder (PTSD)), seizure disorder, mobility impairment, and diabetes.