Seven months ago, a 30-year-old man lost his wife in an automobile accident. His coworkers have become concerned about his mood swings from rage to uncontrolled crying. The healthcare worker recognizes that this is

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.