10 points, pls help. :/

What were some benefits of the lewis and clark expedition?

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.

A“carpetbagger” would have been most likely to come from which state?