Ais a dramatic movement that gets attention. some stand-up comedians dash across the stage, throwing their hands around, as they act out what they are talking about. these become part of the act.

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.