Nearly 40 unmasked House Republicans marched through the Capitol to the Senate floor Tuesday afternoon to protest a congressional doctor's order to reinstate mandatory face masks in the House of Representatives, but not in the Senate, the Hill reported. The bipartisan battle on Capitol Hill over the wearing of face masks continues to rage.

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.