At its beginning and endpoints, the civil service was (is) based on in the years between it was based on

Which of the following contributed most to making the items listed in the box

Whether or not a given study has the possibility of causing harm to participants:

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.