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How important is it to have a powerful army and navy? give two reasons for your answer

2) based on the information, which is an opinion rather than a fact about immigrants to north america? immigrants

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.