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.
Service dogs and emotional support dogs Service dogs. A service dog is a dog trained to do specific tasks for a person that he or she cannot do because of a disability. Service dogs can pick things up, guide a person with vision problems, or help someone who falls or loses balance easily.